Open ecosystems typically coalesce around the simplest possible thing that could possibly kind of work.

The more out-there it is, the harder it is to convince the rest of the ecosystem to coordinate around it.

Compare with "It's just pubsub, which everything already knows how to talk"

It's less common to see a coherent new ecosystem coalesce around some transformative new tech, and more likely around things like "I just took this off-the-shelf component and baked in a few specific conventions".