I would like to suggest adding an optional cross-input matchmaking setting, allowing players to choose whether they want to play against different input methods.

The main issue for many mouse and keyboard players is not crossplay itself, but being matched against controller players with strong aim assist, regardless of whether those players are on console or PC. At the same time, many controller players also feel disadvantaged against mouse and keyboard players due to faster movement and aiming control.

Instead of trying to perfectly balance aim assist for everyone, an optional cross-input setting could give players more control over their matchmaking experience. Players who are fine with mixed input lobbies could leave it enabled, while those who prefer input-based matchmaking could disable it.

This would likely satisfy both sides: mouse and keyboard players who do not want to play against aim assist, and controller players who do not want to play against mouse and keyboard movement advantages.

In my opinion, the real issue is not crossplay, but cross-input matchmaking. Giving players the option to disable cross-input matchmaking would address the core concern much more directly.