This game is about getting huge. So I should be able to have a huge community.
There shouldn't be silly restrictions like that in general. Alliances are not only made for challenges and clan wars.
I want to be able to obtain super power level alliance size of 1,000+ members where I can have A-teams for challenges and A-teams for regular matches so that we can offer a coalition to play with at all times for all desired skill levels.
So that when you log on you can find other friendly people to play with instantly.
It would only be in their interest to allow community super powers that constantly hunt new players to keep them playing.