Maybe it's just me, but sometimes I find it a bit hard to keep track of all my stuff running around the map in attacks and I lose track of my heroes' health with all the lights and animations going on around them. I think adding a health bar to their unit cards/unit tabs (or whatever you call them) would help people to time the abilities better during raids because there would be a fixed position where you could check their health.

idk, just a thought.