Great question! The source files are actually HTML so in truth you are editing HTML but just chunks of HTML. I think the benefit is that it assembles and organizes the HTML so you don't have to repeat yourself with various things like nav bars, etc.

Also by using vanilla HTML it makes it possible to find any CSS targeting your vanilla HTML on the internet and drop it in like so. https://findingmyhtmlgoddess.com/blog/post/seeking-html-godd...

In any case, you could totally take the output in the docs folder and never use the framework again if you wanted. :)