Eh, people always say this yet data shows it’s not true. Many competitive games have had controller vs m+k and found no discernible advantage. Halo for one, gears of war is another I remember.
I play with an elite controller and I have had zero problem winning and going mvp against m+k players in any game I’ve played. I play PUBG where m+k use is rampant and I still maintain a 30-40% win rate in squads, often in 2 man squads.