I'm not sure what you're suggesting. PHP is inherently less complex than languages like JS and python for the backend and results in fewer dependencies because that's what it was designed to do. Quite literally no features required to build even a very basic dynamic website come with JS out of the box: sessions, password hashing, database connectors, input sanitizing, cookies, html templating, etc... It all needs to be either written by you or installed as a dependency. They're all standard features in PHP.