I did some research after posting. The cartridge man is one inexpensive LTer and then there is also another one that uses nested triangular girders. Can't tell what that one costs, but it would seem to be in the $1K range or less. If LTs at that level of cost could compete with top line pivoted arms, that would go a long way in support of any thesis that posits the inherent superiority of the design. But I don't think it would be the case.
No concern re your punction. Just curious.
No concern re your punction. Just curious.