[Zachery]

Has it though?

Consider stuff like wordpress, and other large programs that need an easy to re-use styling language. When you use something like bootstrap, and others know bootstrap, then you're making it easier for you and your customers down the line to build on something.

You can always write your own thing, and in many cases this will work, but then someone else is going to have to learn all of the quirks of your system before they can get up to speed and start using it at scale.