I think you overestimate the risk (and monster generation rates on cleared levels) because level clearing isn't something you do. It's true the risk isn't zero, but it's really very close to zero; so close to zero as to be vanishingly unlikely to kill you even over the course of a long game. The risk may be higher in older versions or variants with different monster spawning, but in today's Angband teleports like that are essentially safe, unless Nick changed things since I last played Vanilla. (Also, it's not true that new monsters will spawn awake, at least not in 3.5.1 which Moving Pictures is playing. They spawn with their usual sleep status, which for most of them is asleep.)
That said, of course it's still not the ideal solution. But if a scroll of phase door is guaranteed to put you into a known space with no monsters (say, you're in a zigzagging anti-summoning corridor and there's just the one monster around and you were meleeing him), that's a perfectly safe escape.
That said, of course it's still not the ideal solution. But if a scroll of phase door is guaranteed to put you into a known space with no monsters (say, you're in a zigzagging anti-summoning corridor and there's just the one monster around and you were meleeing him), that's a perfectly safe escape.
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