I understand it's intentional. What your original post made me realize is that transfer restrictions have become standard terms. More people should understand what that means.

Secondary markets have issues, but so do secondary offerings overseen by the company. There can be pretty big principal-agent problems, both around price and around timing.

I'm less familiar with the traps and pitfalls of RSUs, but in general they seem fairer than ISOs. I hope they're used more widely.