Radio interference and roaming are the primary concerns. There’s only so many channels that Wi-Fi can run on, and they will clash if there’s too many APs near the same band. You also have to ensure that each device is configured to disconnect from a weak signal and connect to a stronger one when moving from room to room, which realistically doesn’t work flawlessly. You want to instead have a few powerful access points in each wing or whatever needs dictate.
That would be problematic on many levels.
Not really. Radios can be tuned if you’re talking about interference.
why is that?
Radio interference and roaming are the primary concerns. There’s only so many channels that Wi-Fi can run on, and they will clash if there’s too many APs near the same band. You also have to ensure that each device is configured to disconnect from a weak signal and connect to a stronger one when moving from room to room, which realistically doesn’t work flawlessly. You want to instead have a few powerful access points in each wing or whatever needs dictate.
You can reduce transmit power and enable meshing and roaming in conjunction.
This is a very common approach, as a meshnet, of course.