Earlier quoted context omitted.
> If you don't want to deal with async functions, then you can use threads! Truly? If some very popular lib become async (like actix, request, that I use), I can TRULY ignore it and not split my world in async/sync?
You can easily convert async to sync by just blocking on the result. The other way (sync to async) is more difficult and requires proxying out to a thread pool, but it's also doable.
An `async` function _can_ call blocking functions, of course, it just blocks the entire thread of execution which could otherwise continue making progress by polling another future.