Just curious: the people behind HTMX have a frontend sibling project called Hyperscript, which handles stuff like frontend state: https://hyperscript.org/docs/reactivity/
I'm not convinced. Hyperscript's reactivity model is highly greppable, and it keeps the no-build approach to Web frontend interactivity. It's "just enough" in the same way that HTMX is.
React probably scales better for huge engineering divisions, but that isn't who the GOTH stack is aiming for anyway.