Yeah, that's the one of the problems with the games nowadays, that you have to cooperate with people. Cooperating is usually not fun from what I can tell.
I play a Lot of Mercy. I love Mercy. But I can genuinely understand the need to nerf her resurrection. It really does just feel useless and shitty to wipe the whole team out only to have it all get instantly undone.
For years in Wow I saw this same thing happen in battlegrounds.
It got real bad on servers with one large sided population difference for Wintergrasp. Elitist casual players didn't want to be told how to play their classes that Xpac, They just wanted to AOE their way to EPICS!
They're trying to make Mercy MORE viable by keeping her close to other healers. Valkyrie is more in line with other support ults; now, it mostly relies on your team already being alive.