Because of JavaScript's prototypical nature, there are some nuances of the language that many people that have been using JavaScript for a while might not have

Because of JavaScript's prototypical nature, there are some nuances of the language that many people that have been using JavaScript for a while might not have known. Things like new on functions, context, how prototypes work, etc... Now with ES6/7/Typescript coming along, you're going to have a new generation of JS programmers that won't even realize you can "new up" a function.