As far as I understand D* only uses id (which is a pretty normal HTML attribute?) to key morphs in SSE. I only use one id for fat morphs on the body, and even if I needed more I'm not sure I'd find that any less ergonomic than other web standard attributes (class for example I have to use religiously in my day job with tailwind, etc).

Can you elaborate on the "too complicated" part? It seems a lot simpler to me given the slim surface area of the APIs?