I don't get why some people think Skyblivion is some threat to Bethesda Elder Scrolls games at all. Mods are always going to be more niche than fully marketed and funded maintained commercial storefront releases.
Skyblivion is going to be limited to what the latest Skyrim release engine supports while this remaster has Unreal Engine 5 stapled on top as the graphics renderer. They added new voice acting. People are developing mod toolchains for the remaster. It's more substantial than the vast majority of remasters we've seen