A big difficulty is that HTML by itself doesn't give you good ways to define templates so it's a pretty dreadful task. Web components can change that in the fu

A big difficulty is that HTML by itself doesn't give you good ways to define templates so it's a pretty dreadful task. Web components can change that in the future but until that it's pretty normal for developers to opt for tools that allow for creating a HTML fragment and building up HTML in another language. Imagine if we had to do the c calling convention song and dance on every function call...