well, that’s what we think but: is it true?
The cartridge stylus tip is below a " tremendous " task where are generated hard and huge forces when ridding the LP recorded grooves.
Those forces come generated with almost at random directions/vectors that are transmited by the cantilever to the cartridge suspension to the cartridge motor and to the cartridge body and from here to the headshell/arm wand and tonearm bearing.
Those movements/vibrations are not a tiny ones but huge ones to generates unstabilities at the tonearm bearing where a unipivot can’t handle with aplomb and where that kind of unstabilities genrates colorations/distortions to the audio signal. This happens in a way down way with fixed bearing tonearm designs.
Take a look to these links on what the at each single groove where stylus cartridge tip has to " figth " and where each single groove is and has different path.
Additional to all those all the LPs comes with micro and macroscopics warps and all LPs are not dead centered mading the whole unstability subject more critical:
http://www.synthgear.com/2014/audio-gear/record-grooves-electron-microscope
https://www.google.com.mx/search?q=lp+grooves&tbm=isch&imgil=ktDEnuPAQUb1yM%253A%253BeuEapQR8NyxSFM%253Bhttp%25253A%25252F%25252Fwww.openculture.com%25252F2015%25252F06%25252Fa-stop-motion-of-a-needle-riding-through-lp-record-grooves.html&source=iu&pf=m&fir=ktDEnuPAQUb1yM%253A%252CeuEapQR8NyxSFM%252C_&usg=__Z4r0L19_k_EmY-GbwrRGAmPGugA%3D&biw=1366&bih=676&ved=0ahUKEwiZyteszZ3VAhXBJCYKHUFNCRoQyjcIMQ&ei=z6RzWdmmOcHJmAHBmqXQAQ#imgrc=ktDEnuPAQUb1yM:
https://www.youtube.com/watch?v=GuCdsyCWmt8
As always I’m not talking here if we like what we are hearing through unipivots or dislike, this is not the issue but to stay nearer to the recording that means we need to stay with distortions ( of every kind. ) at minimum and unipivots can’t help to achieve that main target.
I owned and own unipivots but as I posted I just do not likes because all those.
Can I be wrong?, just tell me. As I said, cartridge needs must be fulfilled by the tonearm design characteristics where bearing and damping make a paramount differences on the quality level of system overall performance. For me unipivots are out of the " equation ".
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.