1) Well, I said his advice was solid yet imperfect which is why I don't support all of his ideas.
2) Disagree about avoiding debt. Avoiding debt is avoiding risk. You are rationalizing buying things when you don't have the funds to do so. Also, in almost all cases, when you buy a car for ZERO percent interest, you either get that deal OR you get to take an additional $2,000 or whatever off. It is rarely if ever the same price. A good negotiator (or really someone who just TELLS the dealer what price they will pay) MIGHT be able to walk out with a decent final price on the car with zero percent interest, but you have to know about holdback, end of month and end of year stuff, and MOST car buyers don't.
3) The way you protect against income stream interruption is to have an emergency fund of up to 6 months of expenses. You don't do this by holding back money you should have paid for a car.
4) The debt snowball IS a good idea for people in debt, I agree, BUT his other advice on what you do after you are out of debt is solid also...don't pay more than 25% of your income for a mortgage (again, solid advice...I don't think people need to do that, especially depending on where they live and what they want to do with their lives, but it is SOLID advice), 15% or more into diversified stock mutual funds (yep...more than 15% if and when possible). Pay off mortgage as soon as you can while still contributing 15% or more to retirement (SOLID advice).