Round table

I'm not saying that Blue always has a complete fuck-up on 6lm, but still, 40% for minus 1-2 roads is a serious blow to map exploration. And what does it mean to def/protect archangels? Unreachability via Dimension Door? And what are supertreasures—a small empty central zone with mines?

there are many nuances in evaluating the layout for Blue

Which of these depends on the number of roads? Do you think these probabilities correlate? Why?
Yes, it's very often possible to get out, but that's like talking about Russian roulette—very often you hit an empty slot.