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Doesn't Micropython already get you 95% of the way towards just running the same Python code on multiple MCUs?

I'm not sure, I've never used it. But I think the issue is that the number of MCUs that support micropython is very small.

MicroPython supports[1] PIC16 and SAMD21/SAMD51, STM32, ESP8266/ESP32 and more, but it also supports Zephyr as a target, and with it the platforms Zephyr supports[2].

So yeah not everything under the sun, but certainly not what I'd consider a "very small" number of MCUs.

Of course, support level varies among the platforms, but you're not going to be doing too fancy things in MicroPython I imagine.

[1]: https://github.com/micropython/micropython?tab=readme-ov-fil...

[2]: https://docs.zephyrproject.org/latest/boards/index.html

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