The “soundproof apartments” seem kind of out-of-place. Yes, it’s a nice-to-have thing, but it reminds me of all the fucked up shit I’ve heard coming from neighbors’ apartments before. Everything else is so aspirational, while that one is just like, “Please don’t let me have to hear my neighbors having sex, committing domestic violence, or their noisy kids, and preferably not all at the same time.”
I think the soundproofing described is primarily meant to limit the external noise for the comfort of the occupants.
I definitely think designing buildings to limit the effect for neighbors of dogs barking or kids crying or a loud movie or noisy sex is a good idea. For domestic violence, though, I'd rather someone intervene.