they redid all the assetes (it’s not just a simple upscale), has all the orginal DLC. Not just Shivering Isles and Knights of the Nine, but also all the smaller home dlc too.
they’re also not spammed the second you leave the tutorial. and are a part of the world now, and NPCs have rumors discussing them
They also gifted the game to everyone working on Skyblivion instead of sending them a C&D like Nintendo did to the people who worked on AM2R
They would have to require people to own the remaster to play it in order to not get sued into oblivion (hah), and even then it might be iffy for the same reason Fallout 4 New Vegas isn’t allowed to use the original’s voice work