I agree there is something as perfect sonics. Though it tends to be the recipe of parts that are greater than merely the sum of parts.
Subjective taste comes into it a little, expectation, perspectives and the genre of music.
It also becomes difficult to seperate from the piece of music itself, if you adore a song great leeway is given for "sonics". There are some tracks I really love the feel and atmosphere of but the mixing is almost demo quality. (often the 80's had demo independent quality or overly bright lacking in body world class studio recordings.) However there was no shortage of amazing songs.
It hugely depends on the genre expectations.
Perfect sonics tends to equate to fidelity, clarity, definition, punch, pleasant tonal balance and yet smoothness, "turn-up-ability".
Of course depending on an instrument and genre, perfect sonics could be crystaline clarity space (smooth detail) and depth or in your face gross distortion.
It is a fun topic that cannot be easily drilled down into without sonic examples.
Dave Gilmour - On An Island gets close to some beautiful sonics to me, merely one example, maybe post some examples. (seems he has a massive NEVE on his house boat.)
https://www.youtube.com/watch?v=zgtoe1CvlHE
This is a track by an underground artist called Lunarave, it was for a compilation so not an artist album/EP/Single track, it is one my absolutely favourite tracks in the genre and it sounds lush, punchy and hypnotic. It is far from being a big track in the genre. It has immense turn up ability.
https://www.youtube.com/watch?v=5_eEtYkqgEs
Totally different genres, one made on probably a £ million of gear and one made on 10 grand. (one recorded instruments and one synths)
There are too many, for the vibe...the sonics are 100pct spot on. Whole Lotta Love
https://www.youtube.com/watch?v=HQmmM_qwG4k
Sister Sledge, like silk !
https://www.youtube.com/watch?v=43qB9FpfCR8
There are endless masters of sonics in disco music...
The Brothers Johnson - Stomp!
https://www.youtube.com/watch?v=tPBDMihPRJA
ABBA, Nile Rodgers, Quincy Jones productions.
"Peak analogue sonics" did seem to be the late 70s. I edited the post to say that it was quite rare to get both in alignment, many superb songs do not necessarily have perfect sonics. There is much greater leeway for underground genres to have a more rough and ready sonic aesthetic.
It can even add to the underground, rebellious characater. You get to a point where it does the song no favours though, it's always about degrees. For example between brash and unlisteneably harsh.