Lousoix: We had no idea what actually happened to him, only that he vanished, so I don't mind him being in the Coils raid. And he's gone for good now I think.
Minfillia: Never had any reason to think she was dead.
Gosetsu & Tsukuyomi: Agreed, they should have just died in Doma Castle. Would have spared us from the 4.2/4.3 Tsuyu arc too.
Zenos: I agree but if they do something interesting with him in 5.0 I can forgive it.
Nanamo: Agreed, I hated how they reset the status quo of UL'dah in 3.0. Even if I did like her development in 4.1.
Gaius: Agreed. SUre we didn't see his corpse but he should have died in that explosion. Maybe I'll forgive it if Shadowhunter does interesting stuff in 5.0.
Sokoban: Sorry I'm having a 'literally who' moment, who is this?
Papalymo (TBD): Agreed should stay dead.
and the Warrior of Light: When has the WoL ever died?

So I agree in principle but I don't think all of these really count as 'deaths.'