Oh FWIW my personal site is static files built with Hugo SSG, and a minimum of JS. I don't think I will ever use a server-side technology for my personal site again. I do think a growing number of users are "seeing the light" in this regard.
Static site hosting with a brand name smashed onto it is a new era? GitHub itself btw is broken on palemoon for one thing. Not here to defend palemoon but it does show one thing: GitHub's frontend is over-engineered.
Not a GitHub Pages user, also not a Palemoon user, so couldn't say, but Palemoon is niche. There's not even an official macOS version.
All owned by the same company. I'd agree about it being revolutionary if it was on some distributed p2p network like freenet, torrent, ipfs etc. But to call some company doing things in a slightly different manner a new era? Come on
Why are websites now less and less optimized? Because people use apps and APIs. Ergo, they're just fetching the data set.
CloudFlare Pages and GitHub Pages are bringing in a new era of fast, static websites. It isn't all doom and gloom. Furthermore, plenty of people are now using static site generator plugins with CMS like WordPress so that there's no database access required for each page load, which is really what slows things down.