It has become a shibboleth of the UX and Agile communities that “collaborative design” is the best way of designing things. Or if not the best way, it is at least better than leaving people to come up with solutions on their own. Regular readers of Webtorque will know that if there’s one thing I like to do, it’s to question things that appear to be received wisdom. The usually unchallenged assertion that collaboration in design is always good is …