I thought, wow, this would be a cool way to work with rust on the RP2040/2350 but then the only books available are only for ESP devices.

A maker lab 99-projects-in-one PCB with a soldered on (or pluggable) RP2350 with companion text would scratch all the itches of my particular interest in rust and MCUs.

As someone who has a lot of C/C++ experience in the MCU world, the most mysterious part of rust on MCUs for me is the world of bit twiddling and register accesses from a safe language. I would love to have a playground to explore this kind of stuff.

And would strongly prefer open hardware like the RP2XXX family over a commercial chip like the ESP.