The only skills I ever learned during math homework were:

"How do I rephrase this question so that the answer becomes retrospectively obvious?"

"I don't know where to even start; let's try something that's been useful before to see if I can break down the problem and identify a path towards the solution."

I might not quite be an unbiased, population-representative sample, but given how much I use these skills versus how much I use my cooking skills (about half an hour per month, on average), and the respective impacts they have on my life, I think it would be fair to argue that what I learned while doing math homework would be far more valuable for the majority of people.

The key turning point being that not all people learn the above from math homework - not all people learn the above at all.