Another data point:
MT7921K and MT7921AU WiFi chips and associated kernel modules have no problem attaching to 6ghz APs. Using arch kernels 5.18.x through 6.2.x on 11th Gen i5 framework .
Getting those chips to make a 6ghz AP requires regulatory domain spoofing, but they do work if you do.
100% agreed that the problem is Intel and their ridiculous Location (un)Aware Registry implementation. LAR is so borked that a single AP heard with mismatching regulatory domain locked out all DFS channels.
Mediatek may not be the performance kings at the moment, but their kernel drivers are way more respecting of open source software principles. GitHub - morrownr/USB-WiFi: USB WiFi Adapter Information for Linux has way more details than I can parrot here if you care to look into it.
I shan’t be buying any more closed blob garbage Intel wifi chips.