Hearing something like the Viv Float arm will make one question how important is getting tracking angle error minimized. In the Viv Float maker's view, arm rigidity and minimizing skating force is much more important. To me the vivid sound of systems with that arm suggests that they may be right (or at least doing something else very well). Their arm has a maximum deviation from tangency to the groove of ten degrees. That means it will also have a skating force associated with such error. But, that is the maximum error and occurs over only the beginning and end of the record, and it is far less than the skating force associated with the about 22 degrees of offset angle for the headshells of typical fixed arms. While anti-skating will reduce skating force, it is a VERY crude compensation and it is better to reduce skating and eliminate anti-skating.
These days, I question the need for ultra-precise setting of cartridge geometry. I do it because I have the tools and the ability (so why not?). The finding that even extremely expensive cartridges are subject to massive zenith error coming out of the factory makes it seem even more absurd to fret about small errors. I do hear the result of other cartridge setup changes, such as VTA/SRA so I make such adjustment carefully, primarily by ear--I set the arm parallel to the record surface and then make adjusts by ear from there.

