Poor range means less interference from neighbors, which I've found is a good thing. I'm pretty sure I have a neighbor with a leaky microwave or cordless phone that wipes out 2.4 intermittently. Remember: interference isn't all WiFi.
It does, and that's generally a good thing. But I have 2 routers in a mesh, about 50 or so feet away, that work serviceably in my house on 5g, and poor connection on 6g. I think in the future people are going to need a lot more nodes. Like, twice as many. But hey, fast speeds and less interference.
I've been at the "have one AP in every air space where we make significant use of WiFi" for ~5 years. My 1700sqft home has 4 Google mesh nodes, and I've moved towards hard wiring them. Has really improved the wifi quality.
A 6 GHz radio is pretty much equivalent to a 5-point-something GHz one.
As a counterexample, 2.4 GHz is completely unusable in our penthouse office. I'd rather deal with limited cell size than continuous interference issues.
Yes, in an apartment, more available frequencies and less ability to penetrate walls is a good thing. Otherwise there’s immense amounts of interference. And it ends up being made worse when people try to improve their own experience by turning their transmit power all the way up. It necessitates that everyone turn theirs up, which then just makes the interference return and spread further.