Yeah, already seconded, so I won’t bother, but it’s the game where I cannot have any other audio running. I just can’t.
No music, no streams, no podcasts, nothing. Which I don’t think any other game has really pushed me into. (That I can recall.)
The closest was probably just when I was taking Counter Strike very seriously, and I’d pause other sound for a few rounds here or there to hear footsteps better, but it was uncommon, and it bugged me. PUBG demands it basically always while playing, and I’ve still put North of 200 hours into it without even regretting that level of focus. (Something I just can’t do with a lot of media, just sitting with one thing for a while, but it’s engrossing enough, and holds my focus well enough that it just… doesn’t bother me at all.) (Which may speak less specifically to quality of sound design, as you said, but more to how important audio is for it, and how much I pay attention to it.)
(Which is why I also did just put it in bold.)