AI copilot is fine with dealing with ATC in FS2020, it’s just the new game where it’s completely broken. Its voice disappears randomly and they spam ATC with constant IFR requests. It was not a problem in FS2020. I have over 500 flights, most of them with default ATC and IFR.
The link you posted is a classic example of a player who doesn’t know how to use ATC in MSFS. They either use wrong barometric pressure and fly at wrong altitude, don’t follow ATC instructions or fly a route different to what they filed on the World Map.