Trends. They're temporary, god-awful and sometimes completely irresponsible. We've seen many trends permeate through different industries, and it seems that none are safe from them. This is especially true with it comes to software development.
Because of this growth-in-change, everyone and their mother seems to be developing JS libraries to "solve a problem" that they think plagues web development. And you know what happens to those libraries? They mold over faster than food in your refrigerator. These libraries either change their API too quickly, or something doesn't really improve from the old way of doing things, and projects begin to suffer for it. Startups are the main victims of this. And that doesn't include the possibility of petty behaviors of developers who release these libraries on npm, and literally break existing or in-dev projects (I'm talking about you, LeftPad).
So for anyone reading this, my advice to you is to stick to proven technologies. Only move to new tech when you know the solution they provide really fixes a problem. New toys are fun, but that's just what they are - toys.