I... I loved Skyrim. I've never used any mods for it, and I've sunk hundreds of hours into it lol
I mean, there are some awesome mods I'd love to use if I ever get back into the game, but I don't think I'd call them "necessary" really.
Anyway the only mods I've ever wanted for FF were a damage meter, some additional UI functionality (more flexibility in font/hotbar scaling, etc.), and maybe some kind of glamour tracker like what mogit and similar things do in WoW. But the devs seem determined to treat all add-ons in a weird half gray don't talk about it they're evil but they're not kinda way, so... Idk. Most bizarre take on add-ons I've seen in an MMO tbh.