I thought it was more about the things you know and focus on, which are right in their narrow domain, but which prevent you from looking at the wider problem an

I thought it was more about the things you know and focus on, which are right in their narrow domain, but which prevent you from looking at the wider problem and therefore prevent you from perceiving, possibly better, alternatives. I know I've spent days perfecting a certain programming paradigm, be it function composition or object orientated design, only to realise that I've lost sight of the overall problem domain and therefore how best to tackle it.