Anyway, I've gotten bored with this topic. The art and science of phono playback was understood over 40 years ago (literally). Nothing has changed. Some GS members probably weren't around 40 years ago. Those who were, probably have "forgotten" what the basic theory is. So here it is:
If the geometry (shape) of the playback stylus doesn't replicate the shape of the thing that cut the groove (the chisel), then it will not be capable of exactly tracing the path that the chisel cut. This type of playback error is tracing distortion, and has been extensively documented, as in the AES Disk Recording Anthology publication.
Tracing distortion resulting from conical stylus geoms is generally referred to as "pinch" distortion. Conical styli with the radius commonly used in cartridges, can't trace a groove path with any significant accuracy, unless peak velocities are kept really low. Probably lower than what you would want to cut (especially with a 12-incher). So conical gave way to elliptical and then on to the various line contact geometries. ONLY the latter geoms allow you to playback reasonably high groove velocities with low distortion. It's not a matter of opinion but a matter of what the laws of physics dictate.