The TransFi Terminator is very different than other straight trackers, it's very low mass arm wand being just one such difference. And actually, there is a technical justification for an arm having higher lateral than vertical mass, having to do with the nature of the groove's modulation. There are white papers discussing this fascinating subject.The issue is that the arm holds the cartridge in locus over the groove so it can do its job. If the vertical tracking mass is sufficient to do that, the lateral tracking mass should be the same.
The problem with any arm that has the bearings above the surface of the LP seems best understood by the idea of two people carrying a couch. If on level ground, they hold the same weight, if going up stairs the guy on the bottom has the greater weight. If the stairs are not as steep, the weight he bears decreases. This is why you want the arm bearings to be in the same plane as the LP surface, to minimize tracking pressure variation when bass modulation and warp are present.
If you move the bearings to a point above the LP (and many arms do) it becomes more sensitive to warp and bass modulation, decreasing the the tracking force as either appear. Shortening the arm wand causes the arm to be even more sensitive to this effect.