The lack of a C box is largely an accident of history. My D Acadian was my first "real" accordion, following my Hohner HA-114 by 10 months. Since the Hohner was in C, I decided to get the Acadian in D.
At the same time that I bought the Acadian, I also bought the Guerrini triple row. (mid 1991)
But that was at the time that Zydeco was transitioning to Bb boxes, which was what I bought after the Acadian. The Master Bb has been my primary single row axe since that time.
I did eventually buy another Acadian in C from someone on this board. But it's so nice and purty, that I never wanted to have it violated by the rigors of taking it on the road. Indeed, it is lacking a mic to this day.
OK..makes sense.....yeah, my Master C, Binci reeds, is in need of a good service, but it's as tough as old boots and old Mr. Charlie built them strong...I guess he had to with people like Beau Jocque pumping the blazes outa them.
It doesn't look as nice as my Bon Temps but hey, it's a workhorse.
I fitted an internal mic following instructions given to me by Greg Mouton...never been a problem.
My Bon Temps Bb is a gem...real nice build and sounds great with the brighter Salpa reeds.