[sgt101]

I think this is down to education. The move from designer to developer is possible down a narrow stack in the context of rare skills in demand (financing the learning curve on that stack). The challenge that developers from this track face is that when they have to transfer their experience from one stack to another they lack the intellectual framework that CS graduates spend 2 years having beaten into them.

All that stuff about types, functional programming, logic programming, modeling, proofs... It helps you understand things - if nothing else as a shared short hand for communication, but really as a deep set of concepts.