Does this ideology lead to significant technical differences from early versions of Angular 1 and early versions of Vue?

Ok, I see, the idea is to render parts of the page on server and swap those parts on the client with things like: https://htmx.org/attributes/hx-swap/

So it's not really an "Angular-1-like", but more like Vaadin in JS.

You keep using the term hypermedia and I'm not certain what is meant by that term (I was thinking it referred to linked media). Hyper means over, right? So is hypermedia more about the environment media is in than it is about links?

I think he meant just hypertext

yes, I prefer the term hypermedia over hypertext because it stresses the systemic nature of a hypermedia system: a hypermedia (e.g. HTML, a hypertext), a hypermedia client (e.g. a web browser), a hypermedia protocol (e.g. HTTP) and hypermedia servers.

we have written a book on the topic here:

https://hypermedia.systems/

you can read chapters 1 & 2 for an overview of what hypermedia is at a systems level:

https://hypermedia.systems/hypermedia-reintroduction/

https://hypermedia.systems/hypermedia-components/

As far as what the term _hypermedia_ means: it is a media, such as a text, that includes within it _hypermedia controls_. Those hypermedia controls allow non-linear branching and interactions with the media, hence the term _hyper_, that is, above, "normal" media, which is consumed passively.

The hypermedia controls we are all most familiar with are anchors/links & and form tags. htmx attempts to generalize the concept of a hypermedia control.

The book goes into gory detail if you are interested in further exploring the idea.