I think these are both related to culture. My company went to unlimited vacation earlier this year and people have been noticeably taking more PTO than before. I ran the numbers and I've used an extra week so far than I would have been allowed otherwise.

Maybe other teams haven't been taking as much, but as far as I can tell people are taking advantage of this because we've all heard the unlimited PTO leading to less time off stories, we don't want that to happen here.