That's a lot, but sometimes a lot is not what your team needs.
Tbh if you're not hitting those clutch sleeps/anti nades you are not doing anything as Ana to reeplace Mercy's value as a res bot. It's sad, I know, but being able to delete a pick is just too op in a game where you need to gain space by killing. Plus that ultimate is a won fight, when nano depends on your teammates, Valk fixes mistaked while allowing them without consecuences.