Are here also proponents who are fine tuning AS by means of hearing? --> Does this "setting AS by listening" work? Or is it only a joke?
No joke. I've posted a simple and effective set-by-ear method several times:
1. Start with no AS and dial VTF in carefully (by listening!).
2. Play real music and enjoy.
3. If you hear R-channel mistracking on difficult passages, add just enough AS to control it.
SUMMARY: leave AS at zero unless you hear the specific problem it's designed to address. Then use just as much as you need to control the problem, no more.
If that isn't a joke then the people who don't use AS at all are doing it wrong.
Not true. The method above starts with no AS. If the rig plays your toughest LP's cleanly then you stay at no AS. That's where my rig is. I've actually removed my AS mechanism altogether because I don't need it with my current cartridge and the arm's noise floor is lower without it, but YMMV depending on your rig and the LP's you play.