[mekster]

Not exactly unhappy but why vanilla? By using transpiler and bundler, you get to,

- Use better JS (TypeScript) to be sent as ES5 (down to IE6 supoort) without waiting for people to upgrade their browsers to the latest, which is forever.

- Upgrade to latest specified version of libraries without having have to check every site and download the min.js or change the script tag url manually and dependencies are resolved automatically.

- Get to use stuff like stylus which is already far better than CSS 3 syntax and again, no need to wait for people to upgrade their browsers.

- Bundle all JS and CSS as a single file (and place all the other assets like images at a specified location automatically), which can be cached for instant load from second page, unless your frontend code is so fat, a single file becomes too huge for it.

- If your server side is node.js, you get to use a completely same language (TypeScript) for backend and frontend.