So, Riot wants ranked to be a team experience...
And then you prevent diamond+ players from queueing as five?
Like, I get your reasoning here, Riot. Diamond+ have dumb queue times, and it's really unfair to have a bunch of master+ friends have to face a professional team in ranked, and and it's a minority of the playerbase...
But seriously, if you're going to make the ranked experience be focused on teamplay and communication for most of the ladder, having that change when you hit diamond is kind of dumb.