> But surely, latency is all about "placebo" and "vibes" and "feel" is it not?

Not sure if I can follow but...no?! My first TFT-TV had 2 seconds input lag. Impossible to play video games on it. That has nothing to do with feelings.

Already 10ms delay has a measurable effect: https://www.youtube.com/watch?v=5qjSGEOEaXo