I think what's arrogant is for a developer to assume that they have the professional skills of another a DA/DBA job when they've never done. Not sure why everyone assumes they can do what a DA/DBA does even w/ NO job experience; rather interesting phenomenon really.

Are there exceptions? I'm sure there are. But you can't set up rules that handle the 0.1% of exceptions.

I was a developer for several years, including OO (went to some OO design classes too). But I wouldn't presume to claim I'm currently qualified to head up a development project, OO or not. Or even a code design project; although I believe I could provide valuable input on code design, I'm not qualified to lead the process.