One big BAD-FI "Faux Pas" is the use of 80MHz channels in use in an enterprise environment. But, what makes it worse is that manufacturers aren't helping the matter:
I don't blame the end-user here for this issue. The installer should have known that an 80MHz in an enterprise environment is not practical, or viable. It was clear what had happened was the defaults were left as it, and there was little to no customization of the WLAN.
By default, 80MHz channels were enabled.
By default, DFS was disabled.
By default, all APs were set to transmit at maximum power.
I agree with @WiFiTodd's assessment: