I have to figure it takes a long ass time to charge it up in a normal game you can ult 3-6 times depending on the champ. I suspect this might be a 1 or 2 per game but yes shutting off the more annoying ults is stupidly powerful and ill prolly play her for that reason alone.Emma's ult is an AOE stun and silence and charm? That's a lot of counterplay in one ability. She's pretty stacked.
I do note she has no mobility it seems and no bullshit range like reed to make up for it in fact it seems even shorter then cloaks beam. I see no reason to not just stay in diamond form just like how theres like no reason to really use hawkeyes explosive arrows or that switching guns with punisher is sometimes killing your damage output.