The Copperhead is also a Unipivot....although like the Phantom's Magnaglide stabiliser.....it has a balancing 'swashplate' to maintain azimuth.
I had a Hadcock GH-228 for 25 years which was a true unipivot and it sounded wonderful with MMs. It also had uninterrupted wiring from cartridge to phonostage. I've also had a Grace 940G unipivot which worked well with MMs....so the pivoting system of the arm I think...is a red herring?
I'm not sure Sarcher...what you're really saying....
IMO, you can not make any solid conclusions about wiring, without testing it out on the same tonearm. Otherwise the differences you hear, or don't hear, could be caused by the arms themselves. Not the wiring.
If I had uninterrupted wiring on all my arms.....they would beat the ones already with that feature by a margin even greater than they do now?.....or if I added 'connections' to the uninterruptedly wired arms....they would be beaten by a greater margin than they are already? :-)
The fact that for 5 years the Phantom tonearm (with its two extra connections).....has consistently rated amongst the best tonearms in almost every serious audio review...proves the point pretty well I think?
There seems to be a slight hypocrisy to this 'theoretical' argument of 'lesser connections'?
Most high-end audiophiles own separate high-end phonostages which 'plug' into separate preamps which 'plug' into separate amplifiers?
To realise the benefits of this 'uninterrupted' wiring principle.....a fully integrated amplifier with inbuilt phonostage should sound better than the high-end scenario most employ?
To reinforce the argument further.....many listeners (including myself)....are realising the benefits of 'adding' a separate SUT before the phono-stage for LOMCs?
A case where an 'added' connection (at the smallest signal level) can demonstrably sound better than a 'purer' cable?
As I said previously....'theory' is great....but IMO is not a 'deal-breaker' when faced with audible proof of its limitations? :-)