I had the understanding that there are some textures that you shouldn't change, like wall textures and stuff like that.
yeah portal / cube textures are fine, the only thing that would be bad is like wall textures with "hints" on them or stuff like that
there was a brief discussion about certain asymmetrical cube textures possibly giving an advantage for the 11/12 cube throw in glitchless, as some orientations of the cube make the throw easier. I don't know if anything came of that though.
For future reference - the above was discussed but in the end it was dropped, they only give a very slight advantage and it would be pretty tricky to moderate.
Starting today, runs that require video proof (top 25) and runs beyond that where video is the only form of proof, now require audio, as recording audio for only the game is now a native OBS feature.