Yup, that's how halo has always been.
Punishment for a small mistake. The game is also based around the controller primarily due to it being an Xbox game since forever.
I'd expect tactical slayer and big team battle to have a few benefits for mouse and keyboard players, otherwise controller just dominates.
I'm diamond 5 in ranked and quickly closing in on onyx going up against controller as well as mouse and keyboard players. Something I considered impossible before launch.