It for sure is risky. But most patients don't even get tested unless they have respiratory symptoms or if they're being discharged to a facility that requires testing. Administration cares about the bottom line, not patient/employee safety.

I can't even count the number of times I've cared for a patient for days to weeks only to have them test positive when the time came to send them to rehab.

Smaller practices (like a dentist) tend to be more vigilant in testing because the people they're exposing are mainly the staff and it hurts the bottom line if they get sick. In hospitals it hurts the bottom line to know people have covid because then you have to isolate them. If you don't know you can put them in a room with someone else.

I work on a unit that does chemo and we regularly have covid positive patients on our unit, no matter how much we scream about it being unsafe.