Not really, it's just why people use library's for a use, they solve the complex problems and make things easer for the things you want to write, making you code shorter, but also require way less work to do the same thing.
This is why most languages are built on more then one, like PHP is built using C and C is a compiled language.
Can you think what it would take to make a web page when instead of coding in HTML you would be using machine language or even c? You would need to make the system to make the window, the system to handle how things are displayed and so on each time you make a webpage before you even make the webpage content.
You cant make a cake with only one ingredient.