Riot- A simple reason why you can never stand up for dynamic q premades
No matter how many asterisks, limiters, handicaps, or balance affects you'll put in to make large premades "fair", you'll never succeed with making anyone happy. Doesn't matter if you remove it from high ranks, balance low ranks by pitting premades against pubbies against far higher skill level to make it "even", you still will fail because of one simple thing.
You give the players an "excuse".
In online competitive gaming, players don't like having some advantage or edge or anything put against them. When it comes to premades, no matter how "fair" you make it, if a player goes into a game solo and gets beat by a premade ever- to them, they got railed against by an unfair system. Whether they've beaten plenty of premades before, they are going to run into confirmation bias anytime they lose.
You cannot win standing up for premades vs pubbies in ranked. This is a problem that will plague you as long as it remains, no matter how "equal" or "fair" you make it.