I think you can understand* math in general. I think not understanding something it's a matter of presentation. Also I think the presentation can be improved. A good-quality AI can do both, hence it can get a presentation that you can understand.

Yet this has zero utility (other than your own satisfaction). Once you understand something, you will likely not even do a better job at explaining it to someone else, so the utility is strictly limited to yourself.

So even ignoring ability to understand the problem is the cost/efficiency of understanding (and applying it).

I agree with your other statements, but I feel you're suggesting the non-sense is scoped to just math. It's not it's almost everything that we do (exceptions are social interactions including care taking, etc.)

So in this frame your "nonsense" is (almost) everything that we do. Personally I'd like to keep doing things.