It does improve the textures, true, but after testing it, I am concerned about how it adds and changes elements in the environment. e.g. Stone walls are now wooden, shrubbery or other vegetation like ferns in caverns and bushes in the outskirts are added.
If I use some of these elements in my roleplay and others cannot see the same thing I do, then it is a failure for consistency and it's an uninstall from me.
As Heretic said, the mod wasn't built with this enabled as wasn't intended to be viewed this way? Perhaps if they added it to the HAK file that made it compulsory to view it this way, then I'd be happy to have it.