Paul__B:
The Arduino - as a whole - represents a "hobbyist" and "low end" commercial market.However successful it undoubtedly is, it pales into insignificance beside the "real" markets. You surely do not believe that genuine Arduinox and all the clones together make up an even vaguely significant portion of Atmel's production of 328s and 2650s, do you? Or that the Raspberry Pi accounts for a meaningful proportion of the market of its ARM processor?
The combination of a serious ARM processor and a hopefully more robust processor for "bit-banged" I/O may be appropriate to the experimenter, but in a commercial product, you simply harden your interface (only as far) as required, and pack it into a case with no expectation of further fiddling.
Interesting. Please shed some light on the real market and commercial product please.