Whether the room has a door on the bathroom or not, business travellers should be getting separate rooms... Over dozens of trips, the only time I've ever shared was a two-bedroom apartment when I went with a colleague for a conference (one had an ensuite so we had separate bathrooms as well as separate bedrooms with doors).

I wouldn't be OK with going on trips (or sending people I manage on trips) where two people had to sleep in the same room, I wouldn't consider that acceptable...

I agree, it's a huge HR risk. It used to be common with British companies sending people abroad. I can't imagine they still do it today.

20 years ago a shared room was kinda the go-to for conferences and business meetings seemed like at companies I worked at. It was normal to share a 2 bed room with another guy, but all the hotels we ever stayed at had a bathroom with door that closed and didn't open straight to the bedroom. It also had a curtain or at least a frosted door if someone happened to open the door.