[krasin]

In this case, an open ISA would allow more stability over time. More over, once we have an open and widely adopted ISA, one can build an open microcontroller. After that, embedded developers will stop getting bad surprises when some specific microcontroller is being deprecated / out of stock and the whole board (and likely large parts of the firmware) has to be redesigned.

And you're right: an ISA don't matter. It could be ARM, AVR or OpenRISC / RISC-V, but it's very desirable to be stable and embeddable into a SoC without purchasing additional licenses.