Yeah, it does seem like JB is focusing almost entirely on Compose Multiplatform at the moment. It seems like a reasonable strategy assuming current resources are limited. I would say that the foundational core of the Compose HTML is really smart and impressive, but as a whole the library is still a bit undercooked at the moment.
If you're experimenting with Compose HTML, we're working on
#kobweb, which is layering useful functionality on top of what's already there; you might want to check it out. One of the artifacts in the project is
compose-html-ext, which is defined by the README as code that should probably exist in Compose HTML but doesn't. It fills in a bunch of CSS API gaps, provides new versions of some things with bugs fixed, and adds missing utility classes. (You could even import just that library and ignore the rest of Kobweb and still be ahead).