People aren't realizing it, but this one is like selling your investment property for a year and a half's worth of rent (and no equity appreciation).
PTO is the employee's asset (& company's liability) - use it/encash it, but it would keep paying as long as you're employed, just like an investment property that keeps paying you rent. If you're given an offer to sell such a property for zero capital gains and a year and a half's rent (cuz that's how long it takes to accrue 280hrs PTO), most people would say no deal. Any asset liquidation leads to short-term cash, but unless you find a better yielding asset, you're at a loss in the long run.
But here most of us are happy thinking this (unlimited PTO) is the Bay area norm and that they'd still be free to take time off whenever they want, but that's not gonna happen. We're relinquishing our freedom to the powers that be. Folks taking more time off than to the liking of their managers will just get the boot (PIP or LR) down the road.
WAKE UP!!