Is it about chasing perfection, or merely being able to accurately reproduce the signal picked up by the microphones?
99% of loudspeakers (a guess) cannot reproduce the entire bandwidth of the signal they're fed.
The vast majority start to struggle with bass below 50Hz. Yet we can all hear 30Hz, can't we? Even if most recordings don't have much below 60Hz, we still want to hear it when they do, don't we?
That should be a standard, shouldn't it? If not then a suitable subwoofer should be recommended by the manufacturer, shouldn't it?
If not, then surely any claim of being a high quality transducer are invalid, aren't they?
Since we cannot hear above 20kHz (and many of us not even above 15kHz) then there's little need for any loudspeaker to remain flat up to 70kHz, although it's no doubt a nice attribute to have.
For sure, we can live with a facsimile reproduction of the original signal (most do), just as we can live with artificial light, (right now in the UK the natural light is nothing to write home about) but in both cases a better facsimile is more desirable, isn't it?