It's clear that it "may operate on a local or remote host" and in this case you run a local thread. Just how much is actually implemented is not clear at all. A lot of frameworks are written to be "extensible" but the extensions are left as an exercise to the reader...

It is nice to have a self-contained example that you can run on your machine, but I think an example that actually shows the capabilities of the framework will serve you better. E.g. show an example of serving network requests by running services on multiple nodes, rather than a toy function with a toy database.

Showing that it's as easy as `run_in_executor()` is nice, but not if it does the exact same thing as `run_in_executor()`.