I feel like JavaScript is a bit of a special case, because there are people out there who, 5-10 years ago, did HTML, CSS, and jQuery, and called themselves "front-end developers", and then along came Node, so they read a few tutorials because it was just JavaScript, and they got some stuff vaguely working and then rebranded themselves as "full-stack developers" - throw in Firebase and Heroku and you have people who can store data and deploy applications to the web with only the most superficial understanding of what they're doing (and yes, that's how you end up spending $30K accidentally on Firebase and thinking that upgrading Angular might fix the problem).