I do wonder how many paid attention during previous FF games and their themes. Look at FF9, a really goofy game with a lot of dark themes and deep thoughts on life and death. Or FFX, how it wasn't afraid to get funny despite how dark the world was. FF5, despite being one of the funniest scripts in FF history, is also a rather dark game, despite this. Like literal world ending stuff going on, and you get dialogue like:
Exdeath: You're pretty good for a reptile.
Ghido: Well i didn't live 700 years by snacking on pizza!
Exdeath: Perhaps you should have. You will find no such delicacies in the afterlife!