Premades Don’t Break Frontline — They Broke the Illusion of the Horde Stampede

[Valence]

Instead of an outright ban, separate matchmaking for premades that matches them against other premades and matches solo players to solo players would go a long way to balancing FL, since it would pit like against like. Some would say then neither queue would get sufficient numbers for a game. That can be alleviated by ideas like reducing the overall player count for a FL match, or letting the queue pop at 8v8v8 and allow more players to filter in during the match in progress.

This would essentially ban from the game all premades that weren't made by sweety groups utilizing all the snowballing combos that give them such a weight on the board. Your little premade with 2 or 3 of your casual friends? Gone from the game.
The reason organized meta premades sweep the board is because they stack every advantage they have: coordination and communication (sync), meta comps and role abilities, and player skill, leaving very few venues for anybody on the other side if they don't stack the same advantages.
What you're actually proposing would actually harm casual groups the most while moving away tryhards to an exclusive queue sync (because their queue wouldn't pop on its own), just so you can have your full solo experience. Some people are ready to see the world burn I swear.