That page is so simple, yet even Google devs are "powering" these simple pages with multiple JS files. Why? Is it laziness? Or just some belief that Angular is

That page is so simple, yet even Google devs are "powering" these simple pages with multiple JS files. Why? Is it laziness? Or just some belief that Angular is required now for even "hello world"? When viewing source I initially thought 'great, a nice clean HTML page'... after all, it's just 3 images fading between each other and a simple form. But then at the bottom we see Angular, Angular Animate, Angular Scroll, and a fourth Main JS file. Way to set an example Google.