I don’t have a problem with it. You’ll get a far better night’s sleep if there’s no one snoring their head off/feeling like a furnace/constantly moving around next to you. If you’ve slept well you’ll be a lot happier and full of life the next day. Also, if you’re the type of person who can only copulate while lying on a bed during the hours of darkness, then separate beds might help spice up your unimaginative sex life.