Amen,
That was the most important sonic change that WA made, as their speakers were pretty much unlistenable for most people. And let's not forget how some guys in the media, like "worthless to the audio fans" robery harley excoriated wilson for using that "old" technology.
Of course, sonically, that tweeter change differentiated wilsons from magicos, which tend to put emphasis on upper midrange, lower treble. And now the new sasha puppy will further differentiate the speaker with a more robust bottom end than the magico in the same price category.
I am afraid you are generalizing here. I have heard the Magico S1 as being tipped up towards upper midrange/lower treble, but not other Magico speakers. It also depends on set-up and gear choices of course.