I think that personal sites are usually the ideal grounds for exploring a new technology or learning a new language/framework/cloud/fill-in-the-blank. That's why a lot of them run on often-times ridiculously over-engineered tech. If you have a site that is working for you - great! Could every developer's blog be a set of HTML files and a script? Sure. But many developers prefer to tinker and build on new technologies, and their personal site or blog is a great place for that tinkering.