I'm not sure I'd go down that road. I totally agree that for websites, Wordpress, SquareSpace, Gatsby, Hugo, and a host of other static sites work just fine. Where I find it hard to make the stretch is, these are not the type of sites your average JavaScript app developer wants to work on. They'd probably be just fine NOT touching that. I know the past few places I've worked, I've never touched the slick "brochure/marketing sites". I think that type of thing is better left to someone who has really honed their HTML/CSS skills. I don't see a whole lot of reason why anyone would want to turn that type of site into an SPA.

I'm not saying developers don't have an attitude problem. We often do. I just think you might be assuming malice where there might be none.