There are many frameworks because there are many, many JS programmers. The web is the farthest reaching platform you can code on, and as a result, there are mo

There are many frameworks because there are many, many JS programmers. The web is the farthest reaching platform you can code on, and as a result, there are more programmers targeting the web than any other platform. As a result, you get a diversity of frameworks to choose from. Frameworks like Angular and Flux/React offer different paradigms of development and there's nothing wrong with that.