FWIW, the word "interoperate" fundamentally -- just taking it as inter- -operate -- means separate things being able to work together. If you can replace one th

FWIW, the word "interoperate" fundamentally -- just taking it as inter- -operate -- means separate things being able to work together. If you can replace one thing for another thing they aren't "interoperable", they are "interchangeable". Regardless, everyone else in this thread -- including people who seem to know what they are talking about -- seem to be defending the other normal usage of the word by talking about supposed issues with running multiple executors at once and bouncing between them. Are you sure I can have a single async function which can in one statement await tokio and in the very next statement of that very same function await async-std without having to jump through some gnarly hoops? https://news.ycombinator.com/item?id=24675155 https://news.ycombinator.com/item?id=24675155 ^ Here is someone -- though from like two years ago -- asking this very specific narrow question and getting back a number of responses that claim this isn't possible (and so these systems are not only not interchangeable but also not interoperable). (That said, there is one person on that thread who disagrees, but other people seem to disagree with them and the only link to any documentation provided -- but which was notably from someone else and so might simply have been the wrong reference -- is about a bunch of third-party glue.)