I get defensive when somebody dismisses my domain knowledge with a quick "why not just do this"? I'm not happy with myself when I react this way, but I do.
Therefore, when I'm in a position where I want to throw out a quick "can you just", I try to phrase it differently, because I know how frustrating that comment can be.
I'm more interested in finding a solution to the problem then I am about protecting my domain of knowledge, or insuring that my coworkers are aware that my domain is special and mine. I can't help but feel that this article comes from a perspective of competitiveness rather than problem solving. Perhaps the reason so many seem to agree with this (even tentatively) is the competitive culture in so much of IT (at least that I read about). I'm glad we don't have that where I work.
Therefore, when I'm in a position where I want to throw out a quick "can you just", I try to phrase it differently, because I know how frustrating that comment can be.