The only place I can see Rust (or Nim, in our case, mainly so we can easily wire in existing C libraries and vendor provided drivers) in embedded land are the “

The only place I can see Rust (or Nim, in our case, mainly so we can easily wire in existing C libraries and vendor provided drivers) in embedded land are the “in betweeners” or “crossover” chips — ESP32-S3, some of the i.MX SOCs, that sort of thing. Where they have enough grunt to do a lot of tasks at the same time, all driven by config over the network, with less hard real-time requirements for some tasks and stronger requirements for others. That’s not that big a segment though, I would think. And in some ways, just chucking extra slower chips at the problem on the same board is simpler.