Comment by the__alchemist

Its interesting how there are so many ways to do various types of concurrency in rust (Hardware-dependent) that don't introduce coloring:

  - Hardware interrupts
  - Threads
  - Thread pools / Rayon
  - GPU (Cudarc, FFI, WGPU etc)
  - SIMD
  - Write firmware for multiple cores

I make use of all of those, but still prefer avoiding Async, for the typical coloring reason. I can integrate the above things into a code base with low friction; Async poses a compatibility barrier.