Yeah, there are a few nuances to latency numbers. The 250ms pure read-react time deals with arbitrary events, but when we can chunk reactions into a practiced

Yeah, there are a few nuances to latency numbers. The 250ms pure read-react time deals with arbitrary events, but when we can chunk reactions into a practiced technique our precision goes way up, to nearly the individual millisecond: thus musicians can play rapid passages with unusual rhythms in time if they have time to plan and prepare, but they lose this ability if dealing with unusually high latency(extreme reverb, amp across the stage, digital audio with huge buffer sizes). The technique, after all, is based on fast confirming feedback that your execution is correct. And like you say, "bouncy" latency is even more disruptive. We can adjust to a small and consistent lag, but inconsistency will degrade any level of skill.