The first is the exemption for times of war which is an enormous loophole in the era of the "long war".
You MUST have that exception because the nation can't be prevented from going to war if the need exists. It's up to Congress to determine if such a need exists.
Second is the handling of interest on the existing debt. If borrowing costs go up from the very low current rates, under this amendment, future interest (from ongoing rolling of outstanding bonds which would continue for some time even with a balanced budget) would be treated as current spending, sqeezing out other priorities.
Again, you just don't seem to understand the concept: it doesn't matter
why you're spending more or less on interest, and whether it squeezes out other things or not. It's a simple realization that you can not continuously spend more than you bring in, no matter how you rationalize it. This amendment would ensure that.
If your credit card interest rate goes up, do you just keep spending more, or are you forced to cut your spending to account for the higher cost of credit?
The third flaw is the maintenance of a "debt ceiling" which is a fiscal fiction which serves no purpose.
It's a critical tool as we recently saw, it might be the only viable way to force spending cuts.