Her new rez isn’t just “possible”. It’s a very potent ability.
Mercy makes plenty of impact by just holding lmb. Bonus points if you have the elite mechanical skill of damage boosting when appropriate. Let’s not talk about the impact that occurs when you use her resurrect and invalidate death.
Valkyrie makes a decent Mercy incredibly hard to kill. A Mercy that’s allowed to do basically whatever she wants for 15 seconds is pretty strong.
I still don’t understand why so many people spam about Valk being the worst thing to happen to Overwatch. It seems a bit like some people want a main healer to simultaneously have the best base kit in her class and an ultimate that invalidates enemy ults.