Pulling xargo functionality back into tier 1 mainline would be an excellent piece of enabling infrastructure for all embedded work. I think a challenge with em

Pulling xargo functionality back into tier 1 mainline would be an excellent piece of enabling infrastructure for all embedded work. I think a challenge with embedded is that the platform landscape is highly fragmented. I would advocate for picking one target CPU and making it tier 2, let the rest stay at tier 3. Pick one that has a cheap development board to use as a reference platform. Don't even try to test everything in the cpu/platform matrix -- just pick one to be the pilot, and the rest will benefit from at least having that one big snowplow clear the road in front. My specific suggestion would be an Arm Cortex-M4 with hard float of some flavor. That clears the road ahead for a lot of hardware of general interest. ST has quite a few easily available dev boards at reasonable prices, but that is just what I am most familiar with -- there are certainly others. I am also a big fan of Micropython, and the reference board for that is the Pyboard, which might be a good inexpensive choice also, not to mention a good way to spread the open source and open hardware love. It would be easy and reliable to flash a Pyboard back and forth between Micropython or some Rust-on-bare-metal image, I would personally be a fan (that's only one data point, but it's mine :)