Lyra Dorian vs unipivot tonearm

You should really ask the manufacture or the importerof the Lyra if there is a reason not to use unipivot arms. I use a 2.2 with MC but not Lyra.

Ah, I think that is only differentiating tonearms that pivot in some fashion vs. linear trackers. The "rigid bearings" part is the key.

I may be able to extend Dan_ed's point. I had a Lyra Clavis for a long time, in different versions, and then a Lyra Titan and Titan i. My experience was that the Lyra pickups did not work well with the parallell arm I was using (Souther in the Clearaudio improved version). I had much mistracking and a general feeling the needle was skating around too much in the groove. Changing to a standard arm (Sme V) solved my problems.