HTMX kept making my radar until I learned React. Now I consider Next/Mithril/SolidJS ahead of HTMX. I'm not sure how legit it is to track the evolution of items I don't get around to trying. :)
I'm not sure they solve the same problems; if you NEED the REST api and want to keep all of that consistent then something like react makes more sense.
If you're just building a webapp then you can do a low-js SPA app that's often significantly simpler AND more performant with HTMX.
But as always, different projects have different needs. <3