I think 85% of home sales in the US are single family. So split up 15% between town homes and condos. OP is describing a small part of new properties. I assume you’re talking about condos. What OP is talking about is more of what you describe, students, singles, and new families (with or without kids).

There’s a lot of active adult 55+ and no kid neighborhoods. I wonder how they compare to what OP describes, I’ve never been in one.