I need to think on this one - I don't think they're suitable for embedded beyond the scope of learning. Eg a non-starter for anything battery powered, or with minimal latency requirements, which are both common in embedded. More subjectively, they strike me as something designed for people who approach problems with a mindset of "I'm a Python programmer - how do I do this without learning a new language?".

I'm writing Python code now to prototype DSP algorithms and generate coefficients for embedded, but I wouldn't run Python on the MCU.