You can't run Pi on batteries (at least not for long). If you want any input or output device, you'll have to buy it, which makes it difficult/expensive to embe

You can't run Pi on batteries (at least not for long). If you want any input or output device, you'll have to buy it, which makes it difficult/expensive to embed in projects (eg https://makecode.microbit.org/projects/toys https://makecode.microbit.org/projects/toys). Also you can program a micro:bit from a Pi :)