Nerfs usually aren’t a “get gud” situation for high-end verifiers. Usually it’s to balance a level because 1 part is much too hard compared to the rest or has an inconsistent timing within a part that should be made more consistent. Verifiers don’t nerf levels because the level is too hard for them, but rather to make them more fun to play for the people after the verifier who have to play the level normally.
Hi I'm a staff and stuff. I'm also a level judge. I'm busy sometimes but you can tag/message me to do a review and I'll try my best to get it done.
yeah, like Dragon said, much of the nerfs are used for balancing propurses (at least on high-end verifications), since, normally, some parts tend to be way harder than the overall level, for example: ZenthicAlpha's Part in Artificial Ascent is, gameplay wise, the old Crack's Part, but with major nerfs for balancing, if Crack's Part passed to the final version, this part's difficulty would be not in tandem with the general flow of difficulty of the level.
Levels tend to have a flow in difficulty (for example, not put all the "hard parts" all next to each other to avoid creating a vaccuum of difficulty in the level).
Another Example of Major Nerfs were the Majacko's ones, altough Majacko hacked his levels and everything, the nerfed parts in his levels, prior to the nerfs, were harder than the general difficulty that the level had and bought some bad inconsistency to the level, that made them more "annoying" and unbalanced (imagine that every insane demon had Cronical Depression's beggining for example, every insane demon would be extremelly annoying due to the unbalanced start).
also, some nerfs are done by pressure, like, for example, Yata's Nerfs, that were made due to TrusTa feeling Pressured to verify Yatagarasu quickly.