You can apply extraordinary measures to eliminate cabinet resonance and the result is a speaker like those made by Magico. Is this good? It depends on whether you like their speakers. There is no defined engineering path to a great sounding speaker. Ultimately, we like what we like, and what we like comes down to a personal preference for a particular combination of strengths and weaknesses (i.e., the right compromises) and perhaps even a liking for certain distortions.
If we never come close to agreeing on what is a great sounding speaker, how can we then extrapolate from this uncertain data what is the right approach to speaker design?
Agreed. If you subscribe to S’Phile, read the very interesting viewpoint of Jonathan Weiss of Oswalds Mill Audio and his sister company’s Fleetwood Sound Co Deville loudspeaker. I am not sure how much I am allowed to quote but it is a quote of a quote so I am think I am safe to repeat;
" Loudspeaker manufacturers in general have moved in the wrong direction over the past decades, in a race to the bottom, trying to make the deadest, heaviest, most nonresonant enclosures".
He goes on to say this effort results in heavy, sluggish sound.
As you have so correctly stated it is a matter of taste. And priorities. I happen to believe that complex machined metal enclosures along the likes of Magico appeal to consumers who think that cutting edge tech must in some res ipso facto manner result in better sound. A few reviewers at Stereophile support this conclusion based on their listening. I have heard Magicos repeatedly and the sound to me is indeed heavy and sluggish. And dull and boring.
I don’t mean to make this discussion an assault or focus upon S’Phile but let’s face it, it is the most widely read and influential audio publication in the US. My take is that there are two basic camps-when it comes to loudspeakers- comprised of John Atkinson, Jason Victor Serinus, and arguably Michael Fremer who gravitate to the inert enclosure approach and then the second camp of Herb Reichert and Ken Micallef carrying on the torch of the legendary Art Dudley who listen for different things and are able to set aside the search for the "latest and greatest" for the beauty of alternative thought and paradigms/vintage/subjectivity and the all-important appreciation of "how does this loudspeaker make me feel?".