We need upgraded textures or better graphical options.

[Altena]

Reshade doesn't have any texture filtering that I'm aware of.

No, it doesn't. Reshade is literally just a shader that works on post-render stuff.
Still makes the game look much better than the base game.

They have already said that HD textures aren't a thing that's going to happen (a few live letters ago, pre-SB).
Mostly because the work involved is absolutely huge.