That's not fair. Unlike many areas of software engineering, web development uses a long list of technologies interchangeably. This set (HTML, CSS, js, rails, so

That's not fair. Unlike many areas of software engineering, web development uses a long list of technologies interchangeably. This set (HTML, CSS, js, rails, some db, lamp, aws, etc) is a mix of languages and platforms. A "full stack developer" is one who can choose the right set of tools from a long list and get a site built from scratch. There is an element of breadth vs depth in this definition. In some types of software engineering it's crucial to have deep expertise of one or a two languages (oracle, or java) but on web development it's often better to have a much broader view of more things. This is why 17 yo web full stack web developers are more common than deeply experienced .net developers. The former takes constant curiosity and the ability to stay up to date on what's new in a changing field. The latter takes thousands of hours of experience.