I somewhat get where htmx is coming from. It's not bad per-say.. I actually like the general idea behind it (it's sorta like Turbolinks, but a bit more optimal using fragments instead of the entire page, though Turbolinks requires zero additional work on the markup side and works with JavaScript disabled out of the box).
With that being said, I imagine it would become unmaintainable very quickly. The problems htmx is solving are better solved with other solutions in my opinion, but I do think there's something that can be learned or leveraged with the way htmx goes about the solution.