>>My ONLY concern is to actually view the arm as a NON FACTOR(sort of)!...Let it allow the cartridge to do it's thing,and be invisible(if that were only possible)!
It is,in reality,only about the cartridge!<<
Totally disagree.
First, it is impossible to view the arm as a "non factor". Not even sort of. A very myopic view.
Second, the cartridge can no more "do it's thing" invisibly than the tonearm can "do it's thing" without error and in total neutrality.
Lastly, the tonearm's impact on accurate playback is far more important than the cartridge in my experience and opinion. I'm not dismissing the cartridge's role but given the choice of an excellent tonearm OR cartridge, sign me up for the tonearm every time.