As one polyamorist (and one type of polyamorist), I very much prefer my living quarters to have doors (with locks), especially a bathroom door. I in fact crave my own private bed/bathroom suite. I am an introvert.
Communal living is great for those who choose it, but what about the kids who are born into it without choosing it? I guess you could argue that anyone who grew up in a commune would be comfortable with it as adults, but then you could also argue just the opposite. Personally I think that some humans are born to be introverts.
Just sayin' ...
Love means never having to say, "Put down that meat cleaver!"