They lost it going forward, and also lost any kind of arbitrage when paired with salary increases. Eg my accrued vacation is “worth” 10% more after a 10% salary bump than before it.
It also serves as a nice buffer when you are switching jobs - you can take the PTO and still be employed (& so covered by health insurance for a bit longer, and stocks are still vesting), making for a nice break from work.
When my company switched from accrued to unlimited PTO, the way they did it was to tell everyone that until their balance got down to zero, they needed to report their time off. So if you quit before you got your balance down to zero, you had it paid out, but most people probably just burned through their balance within a year or so and the liability was gone.
Wow, that’s shitty. Because you could simply have taken the same time off under unlimited PTO as by burning down the accrual, the company effectively zeroed out accrued vacation time. I’d be pissed that happened to me.
I mean, in real terms, I've come out way ahead since I get a lot more PTO now and probably wouldn't have cashed much (if any) out when quitting regardless. If the alternate was to keep my measly PTO allowance but still get the possibility of cashing it out someday when I quit, I am definitely happier this way.