[notnullorvoid]

It's a nice sentiment to say use HTML (or HTMX), but often the people that push for that either don't know enough HTML to know how broken the spec is, or they don't know enough about the requirements of modern web applications.

If you're making static blog or landing page with HTML you won't hit many of the bad parts.

There's really no chance of fixing the HTML spec though, despite the many attempts, which tend to make it worse. Many of the framework authors know this, and in part that's why they've chosen such a user-space heavy path. It allows working around the bad parts of the platform, and iterating in ways where ideas that don't pan out can be left behind.