I honestly don't see that? If it drops inputs, you can't have confidence in your input; but, if it is merely slow to process them, then you don't lose confidence. If you know for sure that something will happen--and even that it will happen in the correct order, as in this case--you can just move on with your life. Have you never worked with a remote text editor over high latency? Or played a musical instrument that had a slow reaction time?

For avoidance of any doubt, I care deeply about my editor latency and agree that those terminals who claim to be "fast" and yet only care about average--not even common--throughout instead of latency misunderstand the problem space... and yet, I still can't say that it is reasonable to lose "confidence in your inputs" if a system is merely slow to process without losing any of your events. If an editor drops any of my inputs at all ever I 100% lose all confidence in what I'm doing; but if it always works then I can close my eyes and still use it without issue!