And if you look at the real, measurable data, most "normal" systems offer at least equal or even better specs.
HiFi is 110% hype. What they define as "smoother" or "more natural" sound is actually a quality loss.
It's often based on "that's how they sounded when I was young and heard my first record, and not as harsh and crude like they sound on a modern amp". All while forgetting that their sound setup back then was cheap, crappy, and made a massacre of the sound waves on any point between record and speaker.