Arm Differences ...... ,etc.

Audiophiles love arms because there are so many complex angles and dangles to adjust!

The dirty little secret is that a Linear Tracking arm eliminates all these sources of error, many of which cannot be eliminated over the full range of arm motion across the record. Linear tracking arms can have problems of their own, but not as many as a pivoted arm. A decent linear tracking arm beats any pivoted unit.

Excuse me now...I must go to the bomb shelter.

I don't think that the advantages of a linear tracking arm are much of a secret, dirty or clean. Given a much larger discretionary budget.....

I agree linear trackers on a suspended table is a very difficult application. There are all kinds of pitfalls involved with that kind of setup. Most people tend to shy away from that combination.