Is that even desirable? There are other runtimes for specific things, e.g. for embedded, WASM, Fuchsia, etc. Doesn't seem like there's a one-size-fits-all runtime.

I guess the proper answer is some kind of minimum standard async interface, but presumably there's a reason they haven't done that.

I dunno really, I've avoided async Rust as much as possible due to the number of footguns it has.