I've spent pretty much my whole life in finding the 'Good Enough' point in everything I buy, whether cars, HiFi, cameras etc etc.
In terms of Hifi, it's audible transparency. When distortion is less than 0.1%. noise less than 80dB, frequency response flat to +-3dB 20-20kHz, I'm happy. No need ever to chase any more dBs or kHz. I'm done.
Consequently, as just about everything for the last 50 years has been transparent, unless deliberately designed not to be, so to 'stand out', I've bought everything on facilities alone. If it meets my operational requirement, it's Good Enough.
This thread reminded me that 20-25 years ago, not long before I retired, BBC and other tenders we were responding to for broadcast equipment only mentioned operational spec. Audio specs, as in dBs and kHz and % were taken as read, as they couldn't envisage anything not meeting transparency specs.
Also, many years ago DIN codified the meaning of HiFi in the DIN spec 45500. It now looks hopelessly bad, but if you think about what it actually means, it's pretty much what one needs for transparency, so anything more than that is unnecessary, and therefore only of interest as a marketing spec.
S.