I'm all about this. When I made my personal webpage, this is how I do it. I'm surprised it's not more popular (at least for certain things) because it looks nice and clean, is fast, and crucially, is easy to put together. Most webpages don't need a ton of JS to "accomplish the mission." I get that not everything can do this, but there are soooooo many sites that can strip down to a more minimal site and have better functionality and a better experience. This is a case of less-is-more.