Tim, don't know what you mean by "Magicoscenti", though it sounds kind of funny. My experience is more with the older wood enclosures, then some of the Q and S series. I have heard the newest M3 a couple of times, and the M2 once. And I have not heard the A series.
I think it is difficult to answer your question because I have found the four Magico lines that I have heard each sounds different. Perhaps the better question is: What flavor do you want? The old M5 and Mini II were highly accomplished speakers which I found difficult to characterize. The V2 and V3 were not as good, though good values and excellent sounding relative to their peers, IMO. The Q series is known for accuracy to the signal. TAS, Valin, Wolf, all wrote about that and I hear it in my Q3. Then came the S series which was designed for a different taste, and built to a different price point. I found the early models not as accurate and transparent and tonally neutral as the Q. They came out with the Mk 2 models which are better. I have likened the Q/S distinction as similar to the Pass Labs X and XA series. Two markets, different sounds, different goals.
Now the M series is evolved from the M Pro and technology marches on, finds it way into the S series, the A series, and the newest M series. I love the M Pro, but have not heard the A series or M2 and M3 set up well enough to really know what these speakers are capable of sounding like.
The Q series has the reputation of being ruthlessly revealing, a bit bright, analytical, cold, sterile, neutral. Some love it others hate it. I hear none of those attributes in my system for whatever reason. Nor do my friends. We hear what Valin and Wolf described at the time of their release as "accuracy", and the closest they knew of how to get to what's on the recording. At least at that time.
I think an owner of the new M6, M3, or M2 who once owned the Q series, or the older wooden speakers may be able to better answer your question. But basically, I don't think there is a Magico sound, because the different lines sound different because they are voiced differently, and designed for different customers. It's hard to generalize the way Harley does in that conclusion. Is he saying the M6 is warmer/richer than the S5 Mk2? I would think it is lower in distortion and more capable in general so I would use completely different language to describe the direction the company is moving in.
It is also about construction efficiencies, profitability, and what they think can sell today to a variety of customers. I mean Porsche makes SUVs and the 9ll, plus more race ready track cars. I suspect the M series and A series sound quite different and that one should not generalize about a Magico "sound", because today, there are so many different models available. It's not like the old days when they only had the wooden speakers, or later when they had only the Q and S lines.
I think Harley wants to come across as knowing it all, but in reality, I find these generalizations a bit lazy and disappointing, frankly.