Aren’t RSUs taxed at the time of grant? Therefore in a refresh grant, the employee would get hit with a large tax bill on the fair market price of the equity, even with an 83(b) election. Most people probably don’t have that kind of money to lay down up front on something that could still go bust. At least with options, you can always (unless you get fired) stay long enough to see the come through to IPO where options are then a sure thing. Am I missing something here on the quote above?