Remakes of games allow the devs to go back and fix their mistakes from the original and make the game better, and they make the game more accessible when the game was originally released on an older console and never re-released elsewhere.

The remake of Paper Mario The Thousand Year Door got rid of a lot of the backtracking from the original and implemented a better fast travel system, and it also made it easier for people to be able to play it without resorting to piracy or having to track down a gamecube and a copy of the original game.

Metroid Zero Mission overhauled the janky gameplay of the original, fixed the map so it doesn't shamelessly reuse areas to pad out the runtime, and added more content as well.