I think it has aged well, and still has value for newer games and replay value for older gamers. Maybe more than most other FF games given it's simplicity and well execution of what it sets out to do.

As some have said, it is a pretty straightforward RPG. No tedious and repetitive side quests, good class system, diversity of areas to explore, challenging battles.

The thing that sets FFI apart from other games is the selection of the four heroes at the start from one of the 6 classes. It allows for over 100 combinations, none of which play exactly the same. Other games allow for customization, but FFI making this the first and permanent decision you make gives it a lot of weight.

Some of the remasters also help remove the unnecessarily burdensome restrictions that make the game more accessible. I need to make my kids play it!