This is because the features boasted by the Special Edition of Skyrim are already available to PC gamers in the form of mods.
While the remaster in certainly a worthwhile purchase for Skyrim fans who play on consoles, it is a slightly more difficult decision for PC gamers. The remastered version of Skyrim includes all DLC and add-ons for the base game, and players who own all DLC and add-ons can upgrade to the Special Edition at no cost. Bethesda recently announced that it would release a Special Edition of The Elder Scrolls: Skyrim, which would include a remastered version of the original game, along with other small updates.