Maybe the causality goes the other way: once you need to do something more complex than the basics, HTMX doesn’t work that well anymore
In other words: It has a steeper complexity gradient, albeit with a lower complexity floor.
If you really need to make a web _application_ with lots of reactive interdependent elements, HTMX is not the tool for the job.
At this point you're better off using something like SolidStart