Consider the story that we're discussing. If you're hired by someone whose incentive is to fire you to meet a metric, then you're never going to get that equity payment. And they have every incentive to load your offer up with as much equity as they can.

And even if they don't, there are lots of ways to find yourself in a toxic workplace. If you're depending on that vesting schedule, your life can suck as you're trying to wait out an arbitrary deadline.

If you treat vesting as a nice optional bonus that you don't plan on, neither situation will feel bad to you.