I'm not sure I follow your thinking, anyways, speculation is not.
The magnets in Plannar drivers are NOT "part of the sound-wave-producing surface", that is the job of the diaphragm, but regardless if one is Plannar and the other Dynamic they both have a moving diaphragm that passes sound through an opening.
This opening in the case of the Audeze's Plannars drivers are the SLOTS formed by the multiple parallel bar magnets (where the fazor elements are attached) in front of the diaphragm as a measure against "interference patterns" (diffraction).
In the case of the Nhoord that opening is their SLOTS pattern on the shell that produces "interference patterns" (diffraction), I wonder if this is the reason for their lack of coherency.
See the relevance now?
In any case, passing sound waves through slots is not a good practice.
I don't have a way to measure their magnet strength, the higher magnet strength of the Ypsilon S2 and Epsilon R1 compared to the Magnum V7 and the Nhoord was easily noticed and I thought worth mentioning.
According to Elleven Acoustica the Epsilon R1 has a little stronger magnets than the Ypsilon S2.
I think the Epsilon R1 is a BARGAIN for the sound quality you are getting out of them, the Ypsilon S2 is still wonderful sounding and a step forward over the old Ypsilon.
Yes it is impressive.
It's more the slot pattern opening than the edge finishing.
Time permitting, it's in my "to-do" list, right now I'm enjoying the R1 in the Grado-ish cups.