Not just that, but the tooling has also evolved and changed. Good luck trying to get an old project with old versions of Yarn and Gulp working well, where tryi

Not just that, but the tooling has also evolved and changed. Good luck trying to get an old project with old versions of Yarn and Gulp working well, where trying to update either breaks the build but using anything other than var confuses the tooling. Provided that you have a build step of any sort (e.g. minifying the assets) and people picked whatever was popular at the time of the project being made.