On the subject of ringing, I would have thought that a jointed arm would suffer less from this issue than a rigid one piece design because the joints should dampen out any resonance within the arm.
It could be that, or the energy could be reflected back to the cartridge if it cannot flow off through the barrier of the joint.
In that case the cartridge could suffer a mild version
of a worker trying to drink a can of beer while working with a jackhammer.
My thoughts or theorys I'm posting in that regard are not knowledge,
I make certain observations and try to find plausible explaints.
If my theory of energy reflected back at less optimal joints is correct,
it could be that the smaller mass of a moving coil in MC is more affected by said reflected energy than the bigger
mass of a moving magnet in an MM.
I'm not claiming it's the joint that's the issue btw, there's a lot of arms with removable HS that work phantastic with any MC you care to throw at them.
It might be the energy transfer as a whole that's less than optimal, be it the material, thickness, surface treatment, mass of the bearing housing or whatever.
For some reason some arms seem to cope really well with MCs, others not so much.
Generally and perhaps a little prejudiced spoken in the past Rega decks were good-great arms with some deck under it, whereas Technics were great decks with some arm on it.
Especially when on a budget and buying s/h, combing the strengths of both is probably not the worst idea.
Or to fit any better arm to a Technics for that matter, as Sonddek did.