I have not played Shadows of shadow of Valentia yet, so I can't comment on that, but I feel like remakes should be something like New Mystery of the Emblem. Adding gameplay features and updating graphics are what I expect of a remake. However, even though I enjoyed Shadow Dragon a good amount, they didn't exactly change much when they could have.
I can agree with that. If people didn't like it in the first release, then you can fix it in the remake. As long as it isn't changed too drastically, it should improve the core experience of the game.