Last couple places I've worked combine sick leave and vacation into a single PTO bank. Previously I had separate sick leave and vacation accrual. My take is enough people abuse sick leave to the point it impacts productivity so employers combined it to discourage people calling in sick since using it reduces an employees bank of vacation hours.
The only real negative I see is people tend to come to work sick more than they used to so they don't burn their vacation time and then spread their crap around the work place. Since Covid I've noticed an improvement in that due to working from home becoming more common and accepted.
