What you call "monstrosity" is just as trivial and rare.
See how this works?
You claimed that HTMX doesn't require learning new paradigms. When it's actually a new paradigm replete with multiple different requirements, custom DSLs, new behaviors etc.
And then suddenly you need to be aware of the quirks: https://htmx.org/quirks/
And then you need your backend to handle all the weird new headers: https://htmx.org/reference/#request_headers
And then you need to learn completely non-HTML things like "attribute inheritance" https://htmx.org/docs/#inheritance
And then you need to learn a whole new DSL https://htmx.org/docs/#trigger-modifiers
HTMX probably has more concepts than react at this point in time.