I would also add that this particular update (Twilight Princess) is a very nice upgrade. I played the hell out of the Gamecube version (because **** the Wii) and this game plays much smoother. Transitions are faster, controls feel better, I think combat is more enjoyable - it isn't much, but it's something. And the Amiibo support is a nice touch. I haven't tried the new dungeon yet, but at least it's something new.
I prefer these over a rerelease of, say, Deadpool. Fun game, yes, but there is pretty much NOTHING new added to it, and the graphics aren't even that much of a step up.
Xbox 360 - Xbox One (or the PS equivalent) is less justifiable for me than something from a previous generation.
But hey, with some franchises they could rerelease the game for every system that comes out, I'd still play it.
DVDs often add something new, but not always. I have a lot of movies on DVD and Blu Ray, and you'd be surprised how often the DVD has more features.