I have been playing in AO3 a lot lately and I noticed a communicating group is a great group. I'm tired of saying "Sniper First" whenever there are 2 mini bosses in a room. I this this could easily be fixed by having a mark button. The host could have a button slightly below the attack button that puts an arrow over the target they are attacking. This is very simple because all the host needs to do is target the correct enemy and hit the button. No more split teams attacking 2 bosses at once!
Devs, please keep this in mind and I hope this could be used in the game. I believe this will help a lot.