[sixplusone]

Carpentry/electrical/plumbing/factory product and process is very standardized, but IT is still quickly evolving and requires adaptation and innovation, making it harder to predict how well someone will handle a new problem based on previous work.

Welders or house framers take designs from engineers and (mostly) work to spec. I have to be the architect, engineer, and builder, usually only based on the approved visible UI, or rough description of a problem.