Mercy's old ultimate

[Wonder-21723]

I own the game for a few months now and when I got it Mercy’s ult was pretty much as it is now but with 2 resurrects, however, I’ve seen videos where her ult was AOE Ressurect, and I have a question. Why was it removed and made into an ability? I understand that it was very powerful but isn’t that the point of an ult? Why an ult that can kill 4-6 people is ok but the one that can bring the same amount of people back to life isn’t? It’s game-changing yes, but again isn’t that the point? Right now, her resurrect ability is most of the time a suicide mission because you are such an easy target for quite a long time. So if someone could tell me what was the reason to remove AOE Resurrect and make it into an ability I would be thankful