i think death fics should have warnings but not character death. Character death happens, but a death fic is surrounded by the whole aspect of mourning and i dont want to go into that without a warning.
FMA warnings amuse me because there is always the foul language warning, Ed is a potty mouth, why warn, it's canon?
I must admit though i did read a fic because it's warning said necrophilia, of course having read the fic she didn't know what on earth she was talking about but i was, why hello new warning.
i very rarely even read the warnings any more. I recently posted a kink fic on my journal with the warning "do not expose to naked flames" and no one noticed so i wonder if we should include them at all except for possible squicks.