At face-value anyone should easily be able to surmise 1v2 is harder than 2v3, which is harder than 5v6, and 5v6 is harder than 6v7. As I said, it would DIMINISH the problem -which is better than having a currently worse problem.
More variety in metas and sub-metas will result in more variety in what characters you can choose and may significantly reduce the need for metas due to large numbers of players balancing each other out in general. This would DIMINISH the issue of metas being overly dominant, I’d wager.
The issue of being forced into certain classes is DIMINISHED when you have a larger variety of players both on your team and on the enemy’s team, by virtue of having more ways you can counter them and more ways your teammates balance out your downsides.
As mentioned in my original post, when it’s 6v7 instead of 5v6, the issue of 1 player having overwhelming power to throw the game is DIMINISHED. If both teams are equal and one has a throw, the team without the throw has a DIMINISHED chance of winning due to the thrower.