I love HTMX and use it in a few projects, but its amusing how whats old is new again. .NET Framework / Web Forms had update panels to do partial rendering of web pages back in 2005. Outside of .NET developers it got a lot of hate. But to a certain extent HTMX is a super well refined and more capable version of update panels and more.
And even that was even taking on the solution from c#'s daddy : Delphi IntraWeb suite, all the way back in Delphi 7 and after.
This whole concept died because of styling and that era of everyone having their pixel perfect psd turned into a html table or a flash applet and you couldn't reconcile both, but sometime out there you can still find an old IntraWeb business app and you realize they had the components, events and everything figured out long before it became cool again.
I always wish for some RAD tool to show up for modern web stack again, but I guess it moves too fast to be worth it, and nowadays front and backend are properly separated disciplines.
In a way HTMX is similar to how we used to write websites on LAMP stacks, except with higher quality of life.
After developing react, angular, Vue frontends for a decade, going back to good old plain server side rendered ruby, elixir, hell even php just feels right.
Especially nowadays where AI changes how you interact with ugly languages like php, but benefit from their deep ecosystems, speed and super fast "build" times.
In fact, despite me being unable to look at php syntax much without vomiting, and finding languages without proper static types nauseating..I'm just more productive in those than in spa slop land.
The web and browser technologies has also moved a lot. The "client side rendering so users don't see a refresh and have an app like experience" is basically a 2010 thing.
I just like being able to pick up old projects that i avoided for ages, and being able to pull in HTMX and make it a bit more modern without rewriting in react/vue etc. And it feels like a modern app, not a 90s app.