Simple, they don't know and some one should take the time to tell them politely. Perhaps they might get offended but if done politely they might appreciate it a lot more than just calling them dumb or dismissing them as lazy.

Something like:


"[2nd healer's name] pls can u raise me asap when I fall? [state reason here so they understand why]."
"You can save more mp if u wait till they are out of their cutscene [state reason here]"

Anyways, whenever some one tells me advice I prefer to thank them so from my perspective it seems logical to just tell them what the problem is.