The big problem I have with HTMX is the same one I have with React server components and similar concepts; I really like being able to just serve static files. Plus the clear separation of server and client really makes reasoning about a lot of different problem cases a lot easier, that's not something to dismiss lightly. (It's a bit of a 'ship your org chart' case, though)

Htmx has very clear separation between server and client. The server is in your backend language and framework. The frontend is HTML.