I think it is something about being able to take a leak in a different toilet every day without hitting the same one twice.
We got a fancy 6 page sales pamphlet on a row of new homes near our neighborhood. I forget the details, but something like 4 to 5 bedrooms, each with their own master bath. Plus a couple of guest bathrooms.
While sharing two bathrooms with three kids did have its moments, usually it worked out fine. Probably taught them how to plan ahead, work with each other, coordinate, share cleaning duties, etc.
I can’t imagine having to clean all those bathrooms! (Although even for our neighborhood homes, if they can afford a home like that they can afford a cleaning person once a week.)
Hey I’m lucky to hit the toilet.