Technicalities are perceived elements of sound that are all effected by the frequency response (some perhaps are mostly related to tuning) and likely no single measurement can capture any of them. Our brains translate the combination of various sound elements into musical elements so we talk of slam, soundstage, detail etc because those are what we care about and understand. People also mean vastly different things with the same words and differ in what is good or bad even if they mean the same thing. FR is a huge thing, bigger than the average hobbyist thinks I believe, but there are meaningful things beyond that. This is where I'm at for now.