try living in one. they are great maybe from age 24-29. they typically cost more than a mortgage in my area. you don't talk to people when you are that close. I find the greater the distance between neighbors the better the relationship.
I am right at the end of your range and noticing similar trends among my similar-aged peers. We all talked of condos a few years ago, but the single family home with room to breathe and quiet is overtaking our previous desires. I am still conflicted due to my hate of commuting, but the more I read about and experience the downfalls of busy-area living (noise pollution, air pollution, inability to change much about the property, etc) the more I feel the desire to buy straight up acreage in Wyoming.
I also see a lot better community with less people, and I'm sure there are many reasons for that.
I lived in a few recently, after living in a detached house, and my experience was not as you describe. The buildings housed all ages and we were all friendly with each other, and if someone was in the shared outdoor space, a neighbor would quite often come to join them. In the building before that, there was no shared space, but everyone was friendly, no different than the detached house place where I live now.
Which isn't to say anybody should be forced into a multi-unit building and mixed-use neighborhoods. But as you point out, prices for these types of settings are often higher than detached homes, indicating that they are under supplied and more people want them then are currently allowed to live in them.
