6GHz is coming thankfully.. wifi channel planning especially across regions is rough.
It has been approved in November: https://www.rcrwireless.com/20221103/network-infrastructure/...
AP firmware is 100% closed-source, vendor-signed blobs these days.
There is an exemption for indoor low-power APs, but the manufacturer has to prove that the housing will not survive outdoor weather (usually rain). They have to deliberately make it not-rainproof.
As a counterexample, 2.4 GHz is completely unusable in our penthouse office. I'd rather deal with limited cell size than continuous interference issues.