If they are keeping ranked as Solo then at least they could make Casual playable with groups. It has pretty poor matchmaking as you get high Crystals with complete newbies anyway so allowing people to play with friends would matter very little for balance.

Would also be nice if they expanded the group size for Frontlines and maybe Rival Wings, if its going to stay as huge bulk of people running around you could at least let people to get a proper group going on.