> I start to think that's why there is still no DOM for the WASM and we have to pingping over JS

I don't think you need conspiracy theories for that. DOM involves complex JS objects and you have to have an entirely working multi-language garbage collection model if you are expecting other languages to work with DOM objects otherwise you run the risk of memory leaking some of the most expensive objects in a browser.

That path to that is long and slow, especially with the various committees' general interest being in not requiring non-JS languages to entirely conform to JS GC (either implementing themselves on top of JS GC alone or having to implement their own complex subset of JS GC to interop correctly), so the focus has been on very low level tools over complex GC patterns. The first basics have only just been standardized. The next step (sharing strings) seems close but probably still has months to go. The steps after that (sharing simple structs) seem pretty complex with a lot of heated debate still to happen, and DOM objects are still some further complexity step past that (as they involve complex reference cycles and other such things).