Controller players do not contribute the common good in the BF6 environment

Controller players just keep camping even in losing situation because they cannot compete in fast phased environment. When controller player amount in server reach like 20% the game just becomes a line holding slop and the game doesn't move anywhere for that 20 minutes. 
In example in conquest you cannot move forward where the other has 3 points and other 2 points. The controller players just stay put on their position at the 2 points and PC players need to push on, but this is impossible.
If controller players would play on their own squads this might be manageable but still something that just doesn't work.

Just make it so you can tune out of crossplay on PC and to play on servers where there is no aim-assist and doesn't support playing on controller not even when playing on PC so these artificially handicapped players won't just come to dampen the game phase.

Its not fun to play constant 1v3+ situations where you need to out perform your equals because of the hidden MMR for each game.
Sometimes it just becomes a rush to clear everything and becomes a spawncamping situation.

You can't fix this by trying to adjust Aim-Assist or how MMR is counted.
The games feel really bad.
Like really really really bad. 
Especially in conquest.