When it comes to inputs you can run a Mnk on a Xbox and a controller on a PC so if cross play is turned off it won’t fix all the issues
That’s because the required solution is to give us the option to disable platform based crossplay not input based.
Very few console players use M&K so that issue is minimised in comparison to all the other issues that having input based crossplay would allow. It’s basic common sense to go with platform based crossplay options rather than input based.