I noticed that GSC/HGSS runs go to red. So why don't Emerald runs go to Steven, or at least have a Steven% category?

Just hypothetical.

i think steven is considered post-game content, were kanto and red are like a second act to the game

I think people have done races of beating steven, but iirc all you have to do is beat the champ to get the option to fight steven, so I think that's mostly why.

As the above, beating Steven is just one extra fight, doesn't really add anything to the existing Glitchless run.

Feel free to try it though, would make an interesting addition to your glitchless run.

New category? Stephen%? Any.1%?