I also prefer Datastar but the new features coming in HTMX4 closes the gap more. Happy to see the ecosystem converging on good patterns.
Moreover, htmx can only do a fraction of what datastar does - you'd need to add on something like alpinejs to be able to try to fill the gaps. Both combined are much larger than datastar, and not nearly as integrated.
Off-course these additional tools are not free [2].
[1] Rocket for WebComponents, Stellar for CSS
[2] Nothing wrong in charging but $349 is a tad too expensive for me. I will happily pay if it was in double digits.