Hi Res Texture Pack

[Colorful]

Probably something along the lines of
>Dev team is small
>Different priorities
>Server limitations jk

None of those apply here though, the textures are created in a very high resolution and then scaled down and made ugly. They don't delete the old textures willy nilly as that would be incredibly stupid for a multitude of reasons, one being they could reuse those assets for future content (a dirt texture would have many uses I'd imagine). But if you mean that's the answer they'd give us, that's likely...