Is tracking error really an issue with modern stylus designs?
All of my favorite sounding/handling tonearms are of a single point pivoted design.
Resonant issues, especially over time would concern me with the Easy's control arm and pivot point mechanism approach. One has to wonder if perhaps what you trade for what you get (zero tracking error vs resonance or chatter issues) is of greater value.
A Swiss watchmakers solution likely would have "jewelled" the bearings and employed capstones (father was a watchmaker), but not at this pricepoint.
Happy Listening!