Nobody is forcing you to use it. I don't use these libraries anymore, but that doesn't mean they don't have a purpose. And no, people shouldn't 'stop with these things'. You shouldn't be the one telling people what they should and should not be doing. You don't have to like it, but there are many developers who are really bad at styling. They don't have a good eye for design and they're trying to build a usable product, or they have an internal need, or want to learn. Libraries such as these have many purposes, even if you don't like them.