I'd argue these are related to current rust libraries rather than with Rust itself. For practical purposes this might not matter. I've been making an effort to

I'd argue these are related to current rust libraries rather than with Rust itself. For practical purposes this might not matter. I've been making an effort to clarify this, as I'm worried these early APIs will scare people away from Rust on embedded. I had to write my own HAL (with ergonomics and DMA-based APIs as priorities) since I ran into the same problems you describe.