Why is there no category for speedruns with no glitches or exploits in story/replay story mode?

no interest probably

The LB1 team has discussed this but have not gotten enough interest from runners to actually form a NMG (no major glitches) category. We also consider RFP as a case-in-point, not many people seem to enjoy running that category.

I have a ruleset I used for NMG but I know the mods have no interest in the category so I've not bothered them with that. Hit me up on discord or twitch if you want those rules or a guide to my version of that category.