Or how about a group insta-cleanse of all negative effects? Or we can keep the same 3 rez in 10 seconds timing but targets come back with half health (D.va comes back at full health but with half mech charge only)?
I didn't think there was anything wrong with the rez in the first place, if you properly utlilize valkarie then you won't need to rez at all.. just my experience...
People tend to forget that overwatch heros have a story behind them. The majority of the skills reflect their history/lore. They are all in someway or another linked. You cant just remove mercy without changing lore of other heros same goes for her rez. Its part of her.