Operating your tools and being able to maintain and repair your tools are the unequivocally essential skills for everyone in every single industry.

If you can't, you are not a professional.

The concepts of machine logic, registers/lookups/etc are essential for every programmer. If you don't have a clear idea about how the simplest CPU functions, you don't have any basis of understanding the abstractions in front of you, scripting in JS. Not a professional.