It's easy to preach this. I went to the author's projects using the link in the bottom and found the first project[1] to be using 4 MB of CSS and 1 MB of javasc

It's easy to preach this. I went to the author's projects using the link in the bottom and found the first project[1] to be using 4 MB of CSS and 1 MB of javascript in the landing page, which is just a static signup. In big projects, the generality of codebase and faster option to do one off tasks matter more rather than best design for the current task. And it is lot harder to have making codebase small or without libraries as a requirement. [1]: https://clerkmoney.com/users/sign_in https://clerkmoney.com/users/sign_in