It’s not exactly unknow. My nan lived in a big 3 bed semi in the midlands, but my grandad was bed bound and lived in the conservatory for 7 years. He had a portable commode but having a flushing toilet would have worked too.
Sometimes health means having a toilet in your bedroom is more important, and having a door is meaningless when you can’t even get into the toilet without two carers lifting you there.
Boldest choice thus far was the one with the OPS next to the kitchenette.
There are some very strange people out there...