This kind of thinking is how you end up with 8 zillion job-securing lines of custom frameworks-within-frameworks and stuff like: def isTrue(x): if x:

This kind of thinking is how you end up with 8 zillion job-securing lines of custom frameworks-within-frameworks and stuff like: def isTrue(x): if x: return true else: return false Code is debt: https://blog.codinghorror.com/the-best-code-is-no-code-at-all/ https://blog.codinghorror.com/the-best-code-is-no-code-at-al... Reviewing vendor libraries always a good idea, but you aren't going to make it very far as a "Senior/Lead dev" if you are constantly using someone's money to reinvent the wheel.