Regarding the initial message in this issue, and enabling recursive event loops, this has proved to be very useful when an event loop is already running and some non-async code needs to run async code. This situation is very frequent when e.g. a library is designed to be async-first, and also provides a blocking API which just wraps the async code by running it until complete.
The nest-asyncio library (https://github.com/erdewit/nest_asyncio) allows that by patching asyncio's event loop, but obviously this doesn't work with other event loops such as uvloop. I was wondering if things had changed since the original post of this issue, and if such a feature had any chance to make it into the standard library.