Duo que is the source of 90% of the toxicity in ranked

There is no arguing this. Everyone hates being with a duo. There is no justification for not having a button that we can select to remove the ability to play with duo players.

I would prefer 5 minute waits just to avoid all duo players. They are toxic, bullies, they massively change the MMR of your opponents, and they will spam reports while taking no responsibility for bad play.

No one wants to play with duo players and if you must keep it, make a completely different que called mixed que in which you can que up to 3 players together and play.

When people see "me and XXX bot lane. Duo que" They automatically get depressed and play worse simply due to the ridiculous nonsense they most likely willl have to put up with.