I feel that sync and async functions are fundamentally different. In python coroutine is really just a function you can pause and while it might seem like it's the same thing as a normal function it's actually very different algorithmic-ally speaking as you can include a lot of low level optimizations which is really what async code is all about — getting rid of that IO waiting.

I love async python but after working with it for better half of a year now it is often a bit tiring as you've pointed out. It feels a bit like a patch to the language rather than a feature even with the newest 3.9 version.

Btw you might like https://trio.readthedocs.io which makes asyncio much more bearable!