
There is Wifi and then there is Wifi! You want the second kind.
1) Home hub Wifi, with all access points unaware of each other, shouting over each other and on default settings. Clients drop off the Wifi as soon as they leave the coverage of their home hub. There is often some sub-par public Wifi in corridors (and possibly even lifts), interfering with (and being impacted by) home hubs in apartments. This is like trying to have a conversation in a noisy pub with the music blaring.
2) Radio planned and properly designed Wifi, with APs connected to a controller. Clients can roam between APs across the whole building, it is possible to have private wireless networks configured and connected to in-apartment LAN ports. Much more efficient design and more akin to a corporate office setup. This assumes a single Wifi and broadband provider across the whole building. A far superior solution compared to 1.
Yes, have and use LAN ports also, but most client devices don't have physical ports anymore and the convenience of Wifi is compelling for most day to day use.
If I was staying in an apartment building, this difference could well be the deal maker or breaker!