If you are already successfully following your YNAB budget, then there is no issue whatsoever, and not needing to be manually underwritten will increase the number of lenders you can work with. This could have a significant impact on your interest rate, which in turn means tens of thousands of dollars over the life of the loan. 

I listen to DR periodically so that I know what’s going on in that part of the PF world. This particular aspect of his teaching always strikes me as contradictory, because in all other areas he screams until he’s red in the face about why can’t you have discipline, you’re flabby, you’re lazy, etc. etc. But when it comes to credit cards, his approach is basically, “There's no possibility you could ever be disciplined about this. Cut them up and close them and take the sharp scissors out of your hands.” 

The sooner you get it, the older it will be when you want to use it -- and therefore the better your rate will hopefully be. Use category balances for spending guidance and keep the card at paid-in-full status. Always reallocate to cover overspending (or better yet, reallocate in advance so there is no overspending.) Plus enjoy the additional product warranty, fraud protection, and cash-back that CCs provide.

I really cannot imagine walking around with significant cash on hand, and using a debit card scares the bejesus out of me, given the number of times my CC has been frauded over the years.

I LOVE my credit cards for the simple reasons of limiting our risk in fraud vs a debt card and the cash back rewards. 

In the past I did the typical thing and got stupid using my CCs and went into debt paying interest on everything. I put the cards away, got frugal and every card was returned to a $0 balance after a bit of stress. 

Now, i use my CCs for almost every single bill and payment i have, This nets me about 2% return on every bill i pay aside from mortgage and auto loans.  Every dollar spent on the CCs is budgeted for with cash in my account so to my budget each swipe of the CC is no different than a debt card swipe. Each month the statement balance is paid in full and in my budget 100% of the complete balance is available so that if i paid off 100% of my CC balances right this second it wouldn't have any impact on the rest of my budget because that money has already been spent.

Almost every dollar I spend goes on a credit card. I’ve never paid a penny in interest. In fact, given the rewards/cash back along with the fact that using the cards allows me to keep almost all of my money in savings at all times, I’m far better off financially than I would be using cash. 
 

Add fraud protection, extended warranties, and the like on top of everything else and nothing else makes any sense for me. 
 

 Because I spend based on categories, or at least categories that can be covered, I can’t think of a negative for credit cards in my scenario.

I've come to learn what Dave Ramsey preaches, but I've never listened to him.  I'm more a Suze Orman gal :).  I think this no credit card stuff is ridiculous.  Who can live like that??  A couple years before YNAB I got upset with myself and cut up a bunch of cards on impulse, and then couldn't get gas the next day and had to go home.  

Hah while I'm typing this I see Neil Cavuto on Fox Business with the headline "Credit Card Debt to Reach 10-Year High."  Hold on, let me listen.  Ok they're blaming it on the slew of Millennials now getting into their prime spending years on big ticket items.  Figures.

I *LOVE* credit cards.  They offer so much flexibility, perks, and security.  You just have to be able to manage them, and YNAB is perfect for that.  I've said recently, the people I know who freeze credit cards in ice, cut them up, or even just only have one are always people on the financial edge anyway.   

Having so many gives me other options that I never know I'm going to need until I need them.  I have a supermarket mastercard that I use for rewards at the store and 10 cents off gas.  But last year they sent me an offer of a balance transfer, 12 months no interest, AND no transfer fee.  It was just at the time I was shopping for an expensive piece of equipment for a small hobby business I unexpectedly started and was growing quickly.  The manufacturer only accepts wire or check (because he can).  I took out a new credit card with my credit union which has no cash advance fees, and loaded it up with the cost of the purchase (about $7k) transferred to my checking account.  I wired it to the manufacturer, then quickly transferred the balance on my CU card to the Mastercard and with YNAB's help started paying it down over the next year (while still using the card).  I ended up paying about $25 in rolling interest for the cash advance until the transfer was complete.  Can you beat that for a business loan??  And I still have the CU card unused until I need a card with its terms, whenever that may or may not be.

Just use YNAB properly and don't be stupid.  You need a credit card.

We also were big DR fans (well, I was LOL). I actually recently wrote a post about the fact that I think I have "outgrown" him. On the subject of credit cards, I have always had issues with his stance, mainly because in Canada our debit card system (which was one of the first in the world) is not on the Visa or MC platform and almost everywhere he discusses using a debit card instead of a credit card doesn't apply to Canada. Visa debit card was launched here a few years ago which is great for the kids online shopping but most places won't honor it like a credit card.

All of this as a long way of saying that we still use credit cards. When we first started we mostly used cash envelopes and only credit cards for certain expenses. Then we got an awesome cash back card and starting charging more. But I would come home and immediately make a payment in the same amount.

Now with the way YNAB handles credit cards, I don't have to do that anymore. In effect, YNAB takes the money and allocates it to the credit card so I don't spend it before paying off the card. Last year we got $800 cash back and this year we got $1200. That's a lot of money to leave on the table. 

I churn credit cards for the points/cash back. I travel a lot for work and I get substantial benefits from doing all of my spending on credit, and then paying the entire balance at the end of each billing cycle to avoid any interest payments. There's truly no reason not to do spend this way EXCEPT for the fact that you can get yourself into trouble if you're not carefully budgeting all of your expenses. Luckily, YNAB is great for such things. It's helped me achieve this goal. Nothing ever goes on the card that can't be budgeted.

Now, if you're prone to temptation with the cards, then I recommend DON'T do it. Instead, a good way to build your credit is to get out a loan from your local bank. Put it in a high interest savings account and make the payments on it to your bank. With this method, you're stuck making interest payments (slightly lower if you're in the high interest account) but it doesn't carry with it catastrophic interest rates if you don't do things correctly.

I love Dave Ramsey and he's done a great job getting many people out of debt; but debt can be used in your favor so long as you're doing things correctly. Dave is for people who have a hard time with debt (and for everyone else too); but I believe many of it is beginner level finance. Take Dave's advise and then adapt it to real world circumstances. I think that's the best way to go about it!