Limits don't become a viable normal attack (unless you eant to remain in critical condition constantly) until you get aura late game and even then you have to shuffle until the limit comes up.

Far too much is made of the enemies leveling issue. It's almost a non-issue. In the first place, it's a decent way to get the same enemily types (like Galbadian soldiers) that appear throughout the game to grow. Secondly, unless you're playing very poorly your growth will almost certainly outpace that of most enemies due to learning new GF skills, having new magic become available, etc.

The main problem with using magic in the game is its in limited supply and the best spells are often junctioned to your stats, which means using them lowers your stats. It's still generally worth it to use some spells and then draw or refine more as needed though.

The carbon copy issue has been an issue with most FF games since FFVI. Arguably, FFV even, where making everyone a mime or something like that at the end is a viavle option.