6 stacking is almost a perfect solution to most complaints that come up on this forum: toxicity, harassment. anger at 1 tricks etc just doesn’t happen if you get choose your own team-mates but I understand why it isn’t viable.
Personally I find the game the most enjoyable when I’m queuing up with at least 1 other person.
How many people would find comp ‘unplayable’ if it required you to queue up with a minimum of 2 people? (ie 2, 3, 4, 5 or 6 people).
Better idea would be have separate queues for solo players and stacks
5-stacking? No comp for you, drop a player or recruit another if you want to comp.