It simplified alot of things in a good way, like the bomber's notebook, but they fucked with the movement and made the deku link skipping slightly more jank, Zora in particular was kinda fucking clipped for no reason and the Bosses were all wierdly homogenized, iirc, they all got a wierd glowing eye weakspot that usually popped out of random spots, while the original mostly let you damage every spot or the obvious places, iirc the first boss used to be stunnable via arrow in OG, and then you could also just hit him with a sword since he was just a regular guy, all of them usually had several ways of stunning that get reduced to just one, and have the eye weakspot shit instead of just hitting em
they also changed the giant mask to make Link into a biggas brute, while it makes some sense, it just looks jank and shit
while remembering and googling around for the changes since i did recall noticing while playing it, i found this video, that illustrates most of the shittier changes
https://youtube.com/watch?v=653wuaP0wzs