I looked at the code examples and instantly saw something familiar. I remember, there was a library that intercepted link clicks, made AJAX requests and updated DOM with response, so that the page would update without reloading. If for any reason the code failed, there was just standard link navigation so you could access the content any way. I think it was pjax library.

It made the site look like a SPA without having to write any extra code. How cool is that.

HTMX resembled me this library. But it seems very narrow cased, there are only so many attributes and their values and you cannot implement anything else. While pjax is generic: you can attach it to any site which has links.

Also you cannot replace Vue (don't use React) with HTMX. For example, if you are making a diagram editor, HTMX won't be useful.