I mean... You can just go read the patch notes to find the things they've fixed and improved. Going from playing the original Skyrim to the Anniversary edition is similar to what a lot of other companies would try to call a re-make.

And with the horse armor- Todd Howard has since claimed in interviews that was priced that way due to pressure from Microsoft. It was the early days of experimenting with online digital content distribution. It was the time when most phones still didn't have touch screens, but had some level of Internet connectivity. People were paying $1-$5 for low-quality 30 second music clips to use as ringtones, or UI skins. I don't think this has been corroborated by anyone else, but it certainly makes sense.