Do you mean automatic difficulty adjustments? If that is what you mean, it's fairly simple:
If automatic difficulty (AD) was allowed, it would be much harder to accurately judge a submission's difficulty. Most people would have a different opinion about what category a submission would fit into. This could lead to issues with multiple runs being misjudged and put into the wrong category.
If the community is in favor, an automatic difficulty category can be created.
Hey everyone, this new line has just been added to the Game Rules for all submissions.
Sub 17:00 (or top 20th) runs should be lag-free. If your recording has lag, please ping a moderator in the Discord server and ask them to review it.
We look forward to seeing more awesome runs, good luck!