But its the ONE point we all use Keyboard and Mouse :-)
Well that's just personal preference, you can be an amazing player even with the controller.
It's up to you to choose
Unpopular statement:
I do think if you are skilled enough with the thumb-stick point-to-point accuracy, a scuff controller is more OP than XIM , on fast flick games due the turns speed, and weird aim look mechanics, controllers are less susceptible than XIM.
God mode is G13 on XIM using WASD and the analog stick for turning; mouse for aiming at sight. Anyone who really wants to go full Try-hard should aim to master that setup.
Saw a fella playing like that (he sent me keyboard cam) it was truly amazing .