Because we were promised "ultra hi-res textures" before release, then get Medium-High 3 months after release.
No we weren't. We were promised higher res textures, and they were. Vanilla textures are higher res on PC than on console.
They never said how higher res though

I'd say that the texture packs is definitely an improvement, and I appreciate it. There are however texture mods that do miles better work, so I'll be using mods instead.
Nonetheless, I really appreciate Bethesda doing something extra for the PC version, even though it, to be honest, isn't on par with things already out on the Internet.