I've seen a bunch of Shovel Knight and Specter Knight runs that have really cool movement in a vacuum but menuing is kinda boring. I know that other games like Breath of the Wild do level speedruns where they get through shrines as fast as possible so why don't we do leaderboards of individual levels like "Explodatorium Any%" or "Lich Yard Any%"?

This is a discussion that comes up regularly in the Discord. You're able to replay levels at any point during the game and this would be the best way to do ILs, so at some point you have to define the rules. What loadouts are acceptable to do a stage with? The ILs that usually get the most attention when this is discussed are ones done during an any% run, but there are multiple any% routes with varying levels of %.

Basically, there isn't really a community consensus on acceptable rules and the community hasn't really had the drive to come up with them.

So basically, if someone were to come up with rules for IL runs and get everybody to agree with it, we can do that sorta run? I feel like the rules wouldn't be too hard, why would nobody want to come up with them?