But some amount of the remaining 83% had student loans and paid them off. Comments on HN and Reddit notwithstanding, a non-trivial fraction of those will be put off by a decision to forgive current student loans.
Some other amount of people, probably a majority, never went to college to begin with. From their perspective, you just gave free money to a minority of people who were already privileged to begin with, by even being able to go to college at any price.
This is not how you win elections, and politicians primarily exist to win elections. It is entirely possible that forgiving student loans would result in a net-negative change in votes in the next election, and maybe for a while after that.
At the very least they need to fix the underlying problem before creating such a moral hazard, or the next round will be much bigger. If they really want to buy votes this way, it would probably be more effective to just give yet another stimulus -- a nice, big one -- to every voter in the country.
I agree when it's 10s of thousands or more the optionality isn't worth it for almost anyone. And it's hard to imagine borrowing to exercise could ever be worth it.
I've never encouraged or discouraged any employee from making an exercise decision (I don't want to get the liability of giving tax or investment advice). I don't even encourage them to file 83(b) except that when I explain why it's a pain for the company if they don't do so, everyone has figured it out immediately :-).