Ofc these pages cannot replace SPAs. That's not the point. The point is: Much of the web isn't SPAs. And much of what is SPAs shouldn't be SPAs. Much of the web is displaying static, or semi-static information. Hell, much of the web is still text.
But somehow, the world accepted that displaying 4KB of text somehow has to require transmitting 32MiB of data, much of it arbitrary code that has no earthly business eating my CPU cycles, as the new normal. Somehow everyone accepts that text-only informational pages need to abuse the scroll-event, or display giant hero-banners. Somehow, having a chatbot-popup on a restaurants menu-page is a must (because ofc I wanna talk to some fuckin LLM wrapper about the fries they sell!!!), but a goddamn page denoting the places address and telephone number is nowhere to be found.
https://idlewords.com/talks/website_obesity.htm
This talk was given over a decade ago, and its takeaways are as relevant today as thy were back then, and in fact maybe even more so.