I agree, but anyway as mentioned, it's about tooling. When I compare creating JS SPA vs. for example .NET MVC website, with JS you will get awesome SPA (oh wait, do you really need that?) - easier way to create dynamic stuff but with cost of bigger complexity which probably comes in ways as project management, DevOps, testing.

I was developing some SPAs in Angular, React and of course there are some great things but I do not see the pure reason because of additional complexity to develop everything in this "modern" way.