I noticed in play testing that Aim Assist was still widely used in the multiplayer. This game is not a level playing field and until something is done with this cheating the game has no hope for multiplayer tournaments etc.
Clearly there are problems that need to be overcome. Who is making the hardware is also a question that is needed. For this reason the campaigns are all that is proactictical in Halo: MCC.
The aim assist is forcing keyboard and mouse players to use a controller. When the controller is used the gameplay changes.