I just went back and got the treasure hunter trophy, so i now have the platinum for the entire trilogy.
Things i want from the inevitable remaster
1.Visuals hold up very nicely and the frame rate is already consistent, 1080p with some extra AA would pretty much cover this area.
2.Mini games and side quests to help break the Cutscene/battle/cutscene design. The side quests should also help explain things that the datalog does, we shouldnt have to read any datalog to understand the story.
3.Quality of life improvements. eliminate the treasure hunter trophy entirely, have enemies drop gil, dramatically improve drop rates, CP, and overall rewards for 5 star victories.
4.They need to explain exactly how much XP you need to master a weapon or accessory, and how much that weapon/accessory will improve. You should also get all of your components back when you dismantle them. That way you dont get stuck with a weapon you dont want.
This is just off the top of my head, but i think these improvements would make the game much more enjoyable for most people.