As an OS developer myself, I can tell you that logging into platforms to quickly tweak something using vi happens all the time. It's not about "directly develop

As an OS developer myself, I can tell you that logging into platforms to quickly tweak something using vi happens all the time. It's not about "directly developing" on the platforms, it's about debugging and trying things out. nano is a very young editor, comparably, invented in 1999, and GPL on top of that. I'm not sure it even come out of the box with any of the BSDs (OpenBSD at least does not seem to have it). vi was first written by Bill Joy himself in 1976, and I'm pretty sure it proliferated in many different forms over many, many different platforms. mg, I don't know!