My apartment had so many issues/complaints they just had the local ISP install AP access points in each apartment. It's one network but has VLAN segmentation an

My apartment had so many issues/complaints they just had the local ISP install AP access points in each apartment. It's one network but has VLAN segmentation and per apartment PSK. This way routers are way smarter at time sharing and power levels for 2.5Ghz are very low plus you can roam anywhere in the complex. Of course I run my own network and do those steps my self. (they were nice enough to give me a port with a public IP). Ethernet is still king for many critical but WiFi seems great despite there still being 35+ SSIDs around. TBH most SSIDs you see have so little traffic 90% of the time so I can't imagine they would decrease the SNR that much (e.g. printer setup networks...) My guess is their neighbor in this case does have a lot of traffic besides the IOT. # of devices and heavy usage just tend to corelate for obvious reasons.