Have I missed something? Why do we use php to include the stylesheets instead of a link tag in the html?

WordPress has a strong developer community. Thousands of people around the world design themes and write plugins for WordPress. To make sure that everything works properly and no one is stepping on another’s toe, WordPress has an enqueue script function. This function provides a systematic way of loading JavaScripts and styles. By using wp_enqueue_script function, you tell WordPress when to load a script, where to load it, and what are it’s dependencies. This allows everyone to utilize the built-in JavaScript libraries that comes bundled with WordPress rather than loading the same third-party script multiple times. It also helps reduce page load time and avoid conflicts with other themes and plugins.