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The great advantage of a Active crossover is [to] veer away from the manufacturers design...

Posted by neolith on October 13, 2016 at 11:29:58:
Sorry, I couldn't disagree more (see my post below). Granted some manufacturers often make compromises in the design or, more likely, in the implementation (quality of parts). However it is just as easy to use a 17.3 mH inductor as a standard 18 mH inductor when ordering in quantity. Magnepan was not cutting costs when they used a 4th order LP filter for the 3.6 when all their previous designs used less costly (less parts) 1st, 2nd or 3rd order filters. They may have save money by using lower quality parts but I don't feel that they compromised the design. BTW when I measured the values of the caps and inductors in my 3.7i, they were spot on with the design - close tolerances suggests that corners were not cut.
Obviously I can't argue with you that your configuration for the MMG sounds better to you than the original design but this is proof of nothing. It's anecdotal and may, as you noted, be particular to your room acoustics and/or your preferences. The bottom line is that you have arrived at a happy solution and that is great but I would not generalize from that experience.
As far as measurements, as Davey notes, my spreadsheet is based solely on mathematics - no measurements and no verification. Using the appropriate math, a one-to-one translation of a speaker-level crossover to an ALLXO will produce the same electrical response and, assuming no modification to the actual drivers, will give the same fs. There are other benefits from active biamping but changing the fs and phase is not one of them.
That said, I do use acoustic measurements to help set up my speakers and I find it beneficial. But this is done to position speakers and tune the room, not to modify the crossover.