What are your walls made of? Mine are steel reinforced concrete. Standard building material where I live, since timber is just too expensive here.
Also I have three buildings (house, workshop, garage) on my suburban property and would like access in all three as well as out in the garden, since that’s where I spend my weekends.
Also, I’ve just never seen the overcrowding issues a lot of people complain about. Maybe because we have different building materials here. 2.4Ghz will go through a concrete wall, but it loses a lot of power… and there’s at least two of them (plus a good sized air gap) to my direct neighbours.
My access point does both 2.4Ghz and 5Ghz at the same time. When I’m in the same room, I get 5Ghz. Walk through a doorway… it seamlessly switches to 2.4Ghz. You don’t have to choose one or the other. You can do both and it will (if setup correctly, which mine was by default) pick the one with the strongest signal.