You don’t say. And yet....No pivoted arm can reproduce the soundstage transparency and accuracy of a linear trackerThat’s quite a claim! What arms have you used to test that belief? In particular, I’d be interested in which 12-inch arms you’ve tried.It’s not a claim, it is science. Less tracking error means there are less phase errors, less phase errors result in a more accurate reproduction of harmonics and more accurate phase and time, resulting in a more accurate and transparent soundstage.
Every pivoted arm as it swings across a record has two points at which it is perfectly tangential. If the above is true then the "soundstage transparency and accuracy of a linear tracker" would be achieved, even if only at those two points.
Every record, as its played the sound stage will become more and more transparent and accurate, then less and less, then more and more again. If its such a big important difference then everyone would notice. No one would need to be told about it.
Is that the case? Not at all. In fact it seems the only people talking about this at all are promoting linear tracking arms as being so great - at solving this problem no one else cares or even knows about.
Therefore, the statement "No pivoted arm can reproduce the soundstage transparency and accuracy of a linear tracker" is what scientists and logicians refer to as, and pardon the technical language, BS.