I recently had a conversation with a senior React dev about Redux with years of React experience. I mentioned during a dry run that you can clear the store, if a local storage store (default), with localStorage.clear() from the dev console. Response: "Cool, I didn't know that.". This guy is good at creating UIs, but that's an example of 'How this works' knowledge I'd of expected him to have. It's a pervasive epidemic of learn just what you need to ship, instead of learn what you need to ship a quality product and hone the tools in your toolbox.