Well, yeah I agree. But I think most people do by default. That's really the idea of vesting... to align employee interests with the interests of the company.

At least at Amazon they gave you a choice pre vest between - sell all when they vest, sell enough to pay taxes, and sell none.

I always chose option 1. This is like personal finance 101.

And for the company the purpose of RSUs instead of cash is to not deplete cash reserves.