I only have a limited math background, but-

You're only looking at the symbolic part: deriving a statement from prior statements. I agree that the derivation either is correct or isn't.

But then there's the rest: the philosophy and intuition behind the symbolic manipulation. You can skip that if your goal is to use the results, but I don't think you can skip that if your goal is to develop the field.

I feel great sympathy for the mathematicians. This must be gut wrenching. It will lead to progress eventually, for sure, but right now a lot of them are in a bad place.

Edit: for readability.

I wasn't making a value judgement. I was being scientific.