There are unique configurations were the toilet is in it's own closet with or without the sink. Other times the sink is out in the open. If you have children, having things separated could be real benefit.
It is just the two of us. We like cleaning up in private having the bathroom fixtures behind closed doors, including the bathroom sink. I could see it a benefit to have the shower and toilet behind separate closed doors, just like we have at home in our master bathroom. My wife would say it is ideal to have a sink in both rooms but who makes such an RV?
One thing certain. Everything all in one room seems to work good enough as it does at home.
