Not everyone can use 5Ghz - if you have one of those 50s/60s/70s houses that were build with plaster/chicken wire (rather than lath&plaster or drywall) then at 5GHz you're basically living in a bunch of faraday cages
(at a company I used to work at we once had to abandon a 5GHz product when we discovered that an appreciable numbers of customers would take it home and not be able to make it work reliably - it would have been a support nightmare)
Not all IoT products support 5ghz - some of mine say they don't (Nest Protect) and some say they do but don't work (Nest thermostat, Netatmo). The only way I could get a stable IoT network in my apartment was to set up a 2.5ghz guest network and put all of them on it.
I live in a relatively modern house (<15 years old) and the 5Ghz signal doesn't make it up the stairs. 5Ghz is 'same room' wifi, and I have Problems with it. It's the same with mobile 5G data, it needs so much more signal towers / transmitters to be effective.
I've hit 'forget' on my home 5Ghz network because it's just unstable upstairs, and my phone isn't smart enough to pick the network with the stronger signal for some reason.
depends on whether it's used for internal walls, chicken wire as part of plaster on external walls alone would help keep the neighbor's interference down
Older chicken wire for internal walls (ie pre-drywall) is the problem at 5GHz (and I'm sure to a lesser extent at 2.4GHz)
I would love it if those down-voting this comment would explain why. Is this comment untrue? How? Does not metal siding end up grounded, however weakly, by rain downspouts anchored to the side of the house then contacting the ground. Does not a relatively contiguous grounded metal sheet around the exterior of a building attenuate 2.4 and 5Ghz?
(at a company I used to work at we once had to abandon a 5GHz product when we discovered that an appreciable numbers of customers would take it home and not be able to make it work reliably - it would have been a support nightmare)