Serious question: Why is it that we generally see only toy systems being done in these languages. I don't mean to offend. If I'm unaware of major pieces of sof

Serious question: Why is it that we generally see only toy systems being done in these languages. I don't mean to offend. If I'm unaware of major pieces of software done in Modula-N or Oberon, then feel free to correct me. I only know of some teaching-level and research OS work, and some GUI work, but little in the way of commercial stuff.