Well-supported Linux nano-stick for 5Ghz/ac wireless

Do you use it as an AP?

Depends on what you use it for and the target.
I use an Alpha Networks as an access point on a Raspberry Pi4 and it keeps having a

mt76x2u 2-1:1.0: error: mt76x02u_mcu_wait_resp failed with -110

error that kills the AP.