I don't feel like the people with difficulty issues are actually complaining about the lag at all. If they were, the complaint wouldn't be "this is too hard" but "this mechanics is unfair/doesn't register correctly." They would be mentioning the fact that they KNOW the mechanic and felt like they did it PROPERLY but got hit anyway.

They are truly struggling with identifying and responding to mechanics. Which makes me think that if the engine/netcode were improved so that visuals/damage snapshots actually lined up they wouldn't have any easier of a time getting through it.