There’s a bit too much to address individually on this topic. The last thread that was loosely related to this this subject hit a few days after I put this blog post out.
TL;DR #1: There numerous excellent geometries to choose from. Dispense with your confirmation bias about Löfgren A/B, Stevenson, Uni-DIN, etc. And faithfully follow your favorite.
TL;DR #2: I strongly suspect the "controlled" experiments many have reported on this thread are heavily skewed by (1) not getting the zenith right and (2) varying it slightly with each setup - invalidating any comparison. Take a look at the distortion and tracking angle curves in the above post, when the zenith is off. I have not compared zenith errors across all alignments, but know this: zenith is the new azimuth, and it’s much trickier to get right than azimuth is. Aligning zenith using the cantilever is a much more flawed method than setting azimuth with a horizontal headshell and calling it "good".
I say this with humility. As @lewm commented above, I would hope that we all look back at our work product from 5 years ago and view it with disdain ... as far as how much progress we’ve made in our journey.
... Thom @ Galibier