I have to say I understand SourceAudio's path given what @rsmith601 already explained.
To me, function wise the PRO series is perfect but they are to big (plastic to me is a faux question since I have personally thew a Behringer plastic pedal over a 4m room into a wall just to prove a point and it still works with an almost invisible crack), design wise the one series are beautiful but the functionalities are to hidden to my liking, the SB2 series are a nice middle ground but you need the HUB to get MIDI and finally the Nemesis seems like the closest to perfect they have ever done.
But the fact is there are all kind of people out there, and for the majority of them plastic is crap and more than the obvious knobs are too many. And, lets face it, we all love our gear and our ideas but SA guys got to feed themselves and their families so, in the end, the best product is the one that sells more and thus the one that suits the majority of people.
I take my hat off to the whole SA crew for:
1 - not selling out to the point of discontinuing less successful products
2 - being cool enough to listen to us and not look just at their own belly
3 - keeping the features available for those of us who are tweekers
4 - not taking the easy path but the quality path