If a neighborhood yoga studio can provide a place to change, pretty sure any healthcare facility can too.
I don't think it's a bad idea to make big investments into such infrastructure now but I think it's completely reasonable it wasn't a priority before.
[1] The average hospital with 50 to 99 beds has a FT+PT staff of about 400 ( beckershospitalreview.com/hospital-management-administration/50-things-to-know-about-hospital-staffing.html ) and half of all hospitals in the US have under 100 beds.
This is a weird thing to remind the parent of, considering the original comment says
>> they are either taking whatever illnesses were in the hospital outside, or taking the dirt and grime of the outside world into the hospital
I doubt there is a lid on the toilet.
Remember too, sometimes folks are on the way to work in their scrubs, not necessarily leaving work.