I read the whole thread and I still think my opinion will bring something new so here I am. On top of what everybody said about audio, I think that another problem is that:

At certain speed/rpm... you get your ears resonating/pulsating with the sound. For example, take the UF GTR in 3rd speed, when accelerating around 8000/9000 rpm, my ears are like exploding. This happens on many other cars, mainly near the limiter of the car.

This is very unpleasing. I only saw one or two people more or less complaining about this but not in a very precise way. I'm no audio expert but I guess this is due to the sound being too perfect/clean as some people described it.

FYI, I have an old 5.1 cambridge soundworks. I didn't touch any sound levels/settings in lfs and I find it good by default, I can hear the tyres screeching and so on, it's just a bit harder.

Keep up the great work Scawen & co,
Thank you,
YYota