Tis good advice, but in most cases I'd question my own code first and then be confused by general complexity - is it the threading library, or the API, or the d

Tis good advice, but in most cases I'd question my own code first and then be confused by general complexity - is it the threading library, or the API, or the database? Rarely do we get a chance to pare back to an isolated behaviour. Also there's a voice that says "surely someone much smarter than me already knows about this".