> It’s pretty limited what an event loop can do: it can wait on a set of FDs, or sleep for some time (or until woken up). But that's what the runtime is. There

> It’s pretty limited what an event loop can do: it can wait on a set of FDs, or sleep for some time (or until woken up). But that's what the runtime is. There's multiple strategies for implementing an event loop (as well as multiple async platform APIs to use), which all directly affect the lower-level abstractions. By replacing the event loop and lower-level abstractions with one common implementation all you've done is add another competing runtime. You can't have more than one event loop and thus you can't have more than one runtime.