I experience exactly the same issue in my home as the OP. It’s very disappointing frustrating, especially when I have an incoming call and no one can hear me as the signal is poor. I’ve gone through setting my home WiFi to 2.5ghz and seperate SSIDs for 5ghz too.
The AW will Occasionally handoff to WiFi or go to LTE but more often than not it keeps wanting to hang on to BT. I’m also using AirPods when doing household chores so it’s frustrating to have the signal break up my music or calls.
For me I’m a remote worker and spend a lot of time working at home, so it’s only when I’m out running, or travelling where the AW excels in it’s use case.
Just a shame about the handoff issues, which I can’t see being addressed unless engineers can change the AW Bluetooth minimum strength to allow for a less sensitive handoff. Similar to the way WiFi access points can be adjusted.