I'm very familiar with the space. The majority of these have never reached production status or any meaningful usage, the few active ones are very niche product

I'm very familiar with the space. The majority of these have never reached production status or any meaningful usage, the few active ones are very niche products - Duktape, Espruino, Quickjs, etc, you'll be hard pressed to find someone running a web server, gui or cli app on them. Hermes might show up in the engine radar due to how prevalent RN is, but other than that, you can bet 99% of projects run Node.js or Deno now. As long as these are actual standards, all the other runtimes also get a fair shot at implementing them. I think it's a move in the right direction.