I've just realised after posting that the AUR package uses the git version, so it's actually normal that we have to use git version for austin-tui too and not the pypi one. Just if someone like me install the pypi version without paying attention, the git one is necessary.
For async code, the issue with normal profiler is that we end up mostly in the event loop. In Python there is https://github.com/sumerc/yappi which has a notion of coroutine profiling (check the README there), so I'm wondering if this would make sense in the context of Austin.
Anyway thanks for your work!