Thanks for your feedback, Baler!
EQ Classic HD are working on updated character, armour, and weapon textures. As far as I can tell their textures are classic and look good. It's the only other texture mod that I use, but I really wish the textures all had mipmaps as the aliasing is very noticeable. In the future, I may consider a release of the global texture files that are AI upscaled and include mipmapping.
I've never tried ESRGAN, but that's a great question. I'm curious as to the quality of the texture upscaling and the performance of the upscaling.
There's another forum thread where
they're upscaling the high-res texture pack. I don't use the high-res texture pack, so I'm unlikely to get involved in this.