Yeah, my experience is all in California, land of lots of labor laws. I think California requires employers to track Vacation/PTO time because under California law it is considered the same as your salary. Which means you can NEVER lose that time, you have to get those hours off, or be paid for them. A certain amount of sick time has to be given, so I suspect that has to be tracked.
My last employer went to PTO for sick time and vacation time a few years back. We have 64 locations, but only 2 are in California and they delayed the switch by a year trying to find a way to make it "use it or lose it" at all locations. California says you can't do that. Now holiday hours CAN be use it or lose it, because in our industry holidays are not days off, just days off that can be taken at a later date.