Thats exactly what I think.
I personally think that her healing is fine as it is due to its consistency, its resurrect that I find to be a huge problem.
I also think that Valkyrie’s chain beams are a problem since it artificially inflates her stats when it shouldnt. She’s supposed to be a strong single target healer yet Valkyrie on top of removing that removes all her weaknesses for a staggering 15 seconds and yet is still underwhelming in spite of that.
At this point I think they should either remove Resurrect or find a way to make it work that doesnt force Mercy into the same behaviours they disliked about Mercy doing including the fact that every change to Mercy when she had mass rez was a buff to it because she was dying or sacrificing herself. And this is when it was INSTANT and aoe.
I made a post a while back that further describes my thoughts in more detail:
https://us.forums.blizzard.com/en/overwatch/t/yet-another-mercy-thread/355676