What I find interesting is that the issue seems to be tracking distortion where a linear tracking arm would seem to have an advantage in this area over pivoting arms. Then a number of years ago Fremer said he prefers the 9 inch to 12 inch arm.
Now we have both MF and JR, seeming to agree the tracking distortion is not really the issue, but that implementation had other distortions From linear tracker, implementation, two different resonant frequencies, chatter, less than perfect cartridge construction, all lead to greater issues that are more audible than is tracking distortion.
I thought it was a pretty interesting discussion focused on issues that are not often discussed when comparing these two different approaches.
I do find the video a bit long.