This is the exact reason why the gaming industry has stayed away from adding in “cross platform” gaming. If you were to match up a K+M player against a pad player, the pad player would be at a great disadvantage (in most situations).
There are, of course, exceptions. Driving games, complex games with several actions (like Tomb Raider for example). I enjoyed god of war and cant imagine playing with K+M. Too many “complex” moves. Ever try Mortal Kombat on K+M? Disaster lol.
Just thinking: BF1 (or almost any from 3 on) the K+M is a pain in the rear when flying anything. Most (anyone i know at least) will drop the mouse and grab the pad in this instance. then back to K+M when playing outside of the aircraft.