I'm retired now but worked for an employer that didn't differentiate between "sick" or "vacation" leave. You got so many hours of universal leave based on longevity. After 5 years it jumped more, 10 years even more etc.
I was there 28 years. Calling it Uni Leave took the stigma away from "sick" leave.
They also had a policy of mandatory "vacation" time and believed taking some time off is good for employee mental health. No matter how much you might love your job it is still a good idea to devote personal time to you and your family.
The way this was administered is you were paid your hourly rate for unused "uni-leave" except for so many hours of mandatory leave taken.
Then, at the end of the year it rolled over!
I took my 2 weeks mandatory leave every year...i wasn't getting that back. However, i got paid for every hour of unused leave over that amount every year.
Our fiscal years were Oct - Sept and we got these checks right before the holidays every year.
When I retired I got a massive check after 28 years of accumulating Uni-leave.