I see absolutely no one using the potions in their speedruns and I still can't find the reason why. Can anyone tell me?
You can't use rift to get any item at all, rift is not allowed.
For The Rooms, there are Category Rules, that say that you aren't allowed to use the Vial, Bottle and Barrel of Starlight.
And for Category Extensions, I think they aren't allowed neither (for individual levels like Library, Electrical Room, the Nest and the Dam).
So you can only use them in Backdoor and All Floors, as you get those items during the run.
recently the CE page has been revamped to give out a hopefully better look in comparison to what it may have been before. Mainly a shoutout to @8y8x and @Nolyswag for being the lead of this revamp and shoutout to the rest of the team who contributed even a little bit to move those runs in the new co