False dichotomy. Unless you're saying that a developer is by definition unable to think about design. A developer might not do as good a job at it as someone w

False dichotomy. Unless you're saying that a developer is by definition unable to think about design. A developer might not do as good a job at it as someone who focused their career at it, but I would be surprised if developers couldn't put together something that was at least passable if they put a modicum of effort into it.