And they did it again for the remake. The remake included all of the game's useful DLC, which included a major expansion, two extra quests, a few features that were added to Skyrim, and a few player homes. However, you had to pay extra for the horse armour (and I think this deluxe edition also had a weapon/armour pack or something like that).

I actually think it's fine to buy horse armour even if you don't use it, because you got your money's worth from the game and wanted to reward the developer. The horse armour itself was stupid. (I had the GOTY Deluxe on PC. It included all nine DLC, including horse armour.) It was just a flashy cosmetic thing you could add. IMO none of it looked good, but maybe someone liked it?