There are an army of people using SPAs for problems best served by a simple and more traditional website. It has been a thing since SPAs started showing up so you have a whole generation who think that Next.js is just how you build for the web.
Then HTMX is to them what the micro-ORMs were for me (and, if you've been in .Net for a couple of decades, I suspect you too).
It was so bizarre seeing people go from pure SPAs, to the concept of "hydrating" a website (ok still makes sense to a point), to coming up with server-side rendering like it's novel.
I mean sure, things like Next, Gatsby, etc can theoretically create the best of both worlds - static site for search engines and no-js users, content first, and very fast client-side rendered content afterwards. But that's a lot of extra engineering, considering a good server-side rendered website is also fetched and rendered within milliseconds.
Then HTMX is to them what the micro-ORMs were for me (and, if you've been in .Net for a couple of decades, I suspect you too).