Yeah these are great approaches too. I'd actually considered a rewrite of the core in rust before I went with mypyc. But it was nice not to have to do a rewrite.

Totally understandable. More options are better anyways.

I have the exact same experience. Both Maturin and PyO3 have been a game changer for the work that I have been doing lately. It works so seamlessly.

We built the logic backing the Temporal Python SDK[0] in Rust and leverage PyO3 (and PyO3 Asyncio). Unfortunately Maturin didn't let us do some of the advanced things we needed to do for wheel creation (at the time, unsure now), so we use setuptools-rust with Poetry.

0 - https://github.com/temporalio/sdk-python

I had no issues with the standard maturin way of building wheels – but my requirements were not special at all. I also did this maybe 5 months ago, so maybe it has indeed gotten better, I cannot tell.