100% agree. I'm in the low 7-figures right now (on paper), and will probably be mid-7 with the next round of funding. So I have 0 chance of affording the taxes if I wanted to leave, and am kind of at the whim of the board if they want to extend my window.
It's not a great feeling, especially when you contributed a lot to the company at a very early stage. I am glad there's companies popping up to help with this problem, like ESO Fund, but in my opinion the companies should be trying to fix this instead.