while what you're saying is true in theory, you still have to make sure that e.g. your form responses do the right thing. You might think "just return the full page!" but it's extra work that for many people is busywork, and makes it harder to reuse things ("my comment post endpoint returns the rendered comment" becomes "my comment post endpoint needs to know what page the comment is in to return the fully rendered page")

In practice I think it's very easy to make your htmx application JS-requiring.