I'd be willing to bet money that if you were to list all your skills and non-skills, I could find at least one thing that you don't know that other SWEs would c

I'd be willing to bet money that if you were to list all your skills and non-skills, I could find at least one thing that you don't know that other SWEs would consider just as "common and foundational". Could be any of: data structures and algorithms, complexity analysis, operating systems, parsing, compilers, databases, networking, user interface programming, OOP, FP, MVC, markup languages, the web, graphics, manual memory management, pointers, computer architecture, etc.