I think SCH is in a pretty good spot. It might not have good self-peel tools compared to other healers but its entire niche is controlling teamfights towards its favor. I'm actually surprised people call SCH a weak healer when Seraph gives your entire team Excog, another shield, and crowd-control resistance. Combine this with Bio and Adlo and Mummification, it's going to be seriously hard to stop your team. My only issue with SCH is that Seraph takes so freaking long to spawn, she's dancing around for like 3 whole seconds before she actually does something.