I'd actually vote to disallow this. The issue here is simply the fact that the retexture patch adds a visible hitbox when focusing, something that is missing from the original game and as a result creates an advantage.

It definitely changes the gameplay significantly to the player's advantage, so I don't think it should be allowed either

I would like to revisit this year old convo! If you don't mind. I don't expect a response but I'd like to give my thoughts.

Personally, I've found focusing really doesn't help me much. Since I already know precisely where my character's hitbox is. I think there are many pros to allowing retexturing aswell. It makes the game way more appealing to the eyes. Which would greatly help runners since we play the game over and over. It wouldn't surprise me if this has discouraged someone from running the game.