Having lived for periods of weeks to years with very close friends and relatives and in other cases with total strangers in field locations, I think it would be extremely difficult for someone of my introverted inclinations to do this again long term. Hell, I get extremely irritated sharing our kitchen space with anyone but my spouse (and sometimes even sharing it with him), so the idea of people 'hanging out in a common kitchen' gives me hives. The majority of my space would need to be completely mine (or mine and DH's, or mine and maybe one of the tiny number of other people that I have enjoyed living with long term). I could adjust to a common space for socializing, and maybe for dining. But bathrooms, bedrooms, general intimate living space? No way no how not until I'm forced to resort to a nursing home. But, essentially, this is more or less what upscale apt complexes and condo communities already have (clubhouse, pool, gym). So if I want to live like that, I'll just move to one of those. In the meantime, I like to do my socializing on neutral ground, away from peoples' personal space.
ETA: A monastery or convent might be an exception to this for me; that does hold some appeal, partly because people are quiet and minding their own business or engaging in quiet activities most of the time. My atheism might be a problem, though LOL.
Also, I wish I didn't have this strong dislike for sharing intimate space, because it would make planning for later life less difficult. And I guess it could save money under some circumstances, so I salute those that can tolerate it.