Well I and many like me... disagree with that assessment. For starters, I don't force anyone to play with a controller and lots choose too because of AA... add in the fact that along with AA they get lower recoil and now that's double the advantage.
And if that's how developers really view things, they need to also remember that not everyone is a pro and not everyone is young. I'm almost 60 with disabilities and my reflexes are nowhere near what they were when I was 20 yrs old playing BF2 when it released. But I still use M+K... even though I struggle to get kills a lot of the time.
Everyone should have the option to disable crossplay. At worst, it will be harder to find a match depending upon location and time of day... easy fix is to then just re-enable it, like I use to prior to CoD removing it after MW2019.