Honestly the inventory management is nowhere near as obnoxious as FFIIs. I mean yes lugging around extra gear with limited space in case you decide to switch jobs on the fly is annoying at times but not as bad as an inventory system that gets smaller as the game progresses because because the designers decided to let Key Items count as space in your main inventory and they can't be removed even after they have served their purpose. Considering how selling dropped scrolls is easy money it gets annoying having to waste possible income cause your inventory screen is plugged up with a dozen useless items you can't do anything about. At least FFIII had the decency to introduce the Fat Chocobo.

Yes, Auto-Targeting is probably the biggest addition to the series that really set this game apart from other RPGs of its time as well as its imaginative use of the Job Class system and sheer amount of different jobs it introduced with better variety and more nuanced roles which games like DQIII really can't compete with.

I feel the thing FFIII does the best is really the flow of giving the player freedom to explore. I really feel they nailed it with this game whereas other entries tend place you on tighter rails for longer periods of time or like much later titles (FFIX and onward) leave opening up the whole game until near the end. It also had tons of out-of-the-way towns to find which made it more fun to have that freedom. I honestly feel it is just an overall well designed game.