> 1) In my career, I've never seen layoffs which were at all good at selecting the bottom 10%. Who gets dropped is pretty random.

This is very true, and I would say definitely the biggest weakness of my point. In a theoretical world in which you can drop the bottom 10% of performers, I think that's clearly the right thing to do, but obviously practice is not the same as theory.

I will say the one other thing about 10% paycuts for these companies that would drive me out is that the companies are still making lots of money. If you're in a business where belt-tightening is plausibly necessary (something that has boom/bust cycles, for example, and hits a particular bad bust one), maybe I can accept a pay cut. If you're cutting my pay but still maintaining a shareholder dividend, I am gone.