With FF7, what I mostly wanted was the same core story but with lots of new side-content and character development.

So I got most of what I wanted. The only changes I'd make to have Remake be perfect is:

1) Ditch the plot ghosts and changed ending. Just stick with original plot all the way.
2) Reduce the padding in some of the dungeons, and in exchange for that add another explorable hub area (similar size to the three Sector 5,6,7 hubs). Maybe an above the plate setting? Was kinda disappointed how little we saw of that.

That's pretty much all I'd change. Oh and I'd also make it more explorable throughout the game, so you can backtrack at any point.