This criticism has no content. You like Go better, that's fine. But that doesn't mean it would be "more suitable" for these microcontrollers, because the whole

This criticism has no content. You like Go better, that's fine. But that doesn't mean it would be "more suitable" for these microcontrollers, because the whole point of these is to run a dialect of Python, which is novel. If you want to write in a low-level language there are already many microcontrollers you can trivially program in C or whatever.