While i fully understand where you coming from i think a pure 6vs6 SC will be not good overall for the community. with such a low population we need some randomness to have a healthy mix to keep everyone motivated.
Also 12 vs 12 allows for way more variable grp compositions.
I still think that at max. 1prem + 1 random set would be the healthiest version for normal SC .... sometimes the better premade will lose due to better PUG adds on the other side which will help to keep everyone motivated.
- weaker premade have a chance to win vs better premades due to better adds
- Pugs will have a premade in SC they can support and have a chance to be the tip of the scale !