Thank you for your answers. Putting runners not using the metronome at a disadvantage is a strong argument. Nevertheless, the alternative idea would to be differentiate runs with the metronome used and those in which it wasn't.

To give an example, in the Minecraft Random Seed speedruns most of the runners use the F3 console to assess very important information. It is not banned, but the information on whether F3 was used is displayed each time on speedrun.com. Achieving a great time without using F3 is seen as very impressive. Maybe something similar could be adapted in the case of metronomes.

On the other hand, the problem with defining the metronome still persists. To hit a frame responsible for the catapult glitch you need to wait ~720ms between the strafe key-down and ESC key-down. This is around 83 BPM for a single tick and 166 BPM for a double tick delay. There are plenty of songs with both tempos. Are those metronomes?

Hey! I'm thinking about one of the first points of the detailed preliminary rules. As it is preliminary I decided to open this thread and start a discussion. Why exactly is the use of metronomes not allowed?

Additional questions:

1. How is it verified that the metronome wasn't used during the run? Should runners submit not only recordings of the game but also recordings of themselves and their surroundings?
2. Is listening to specially constructed playlists compiled only from electronic house-like songs with e.g. 166 BPM and using them as help considered cheating? If it is, should listening to all kinds of music during the run be banned?
3. Are runs performed in a room with an old grandma clock giving a distinctive tick every second considered cheating? A runner could use this as a metronome.

I imagine a lot of potential for abuse and not really seeing the benefits of this rule.