yeah I wonder why they don't do that. must have a reason?

Well bending all the way down to the floor is much more difficult for caregivers, for one thing.

Practical (bending down is harder), sanitary (the dirt is usually on the floor), safety (connecting any medical equipment is more dangerous, administering drugs is awkward and also more dangerous), etc. It's hard to impress some people with innovation.

Sometimes there are bugs on the ground.

it’s not very clear, but i think this is without a matress, like a camping cot

it’s worth doing this because it raises the person up from the floor which if concrete drains heat quickly, or is less sanitary, and helps caregivers not bend down as much

It may seem less wasteful for someone who is rather limber, but it is not practical when some people have difficulty getting down onto or up off of the floor, particularly as we age.

If you're having that problem, look into DDPY yoga, they have a whole section on how to get up off the floor when you're not young and limber.

having slept on a mat on the floor for ~1 year until I dislocated my spouse's shoulder throwing a cockroach off the bed in a sleepy panic, I would strongly suggest against it.

Are you trying to say this wouldn’t have happened in another bed?

I’m not sure how being raised off the floor would change things.

yes, they're way less likely to crawl up. only ever had it happen on the floor

A floor can get relatively cold, and may act as a heat sink.