Every desktop motherboard on the market that has WiFi implements it by means of a M.2 2230 card inside a shield can that's screwed to the motherboard, with ante

Every desktop motherboard on the market that has WiFi implements it by means of a M.2 2230 card inside a shield can that's screwed to the motherboard, with antenna connectors on pigtails coming out the side of the can to protrude through cutouts in the IO backplate. The WiFi is already a self-contained module with a standard hardware interface and its own FCC ID and certification. I don't recall ever seeing a motherboard include WiFi support in its UEFI firmware. So from the perspective of the motherboard manufacturer, WiFi is just a component they stick on the board and ship, with no regulatory overhead aside from duplicating the WiFi module's identifying information on a sticker that isn't hidden beneath the VRM heatsinks. The motherboard market really couldn't tolerate any wireless solution more complicated than that.