Bedrockgames
I post in the voice of Christopher Walken
Part of the skill is not rushing blindly when there is no visible sign of danger. If you are always telegraphing, play becomes too easy. You want to make it more life like. So you could say you are measuring their prudence or caution. But it isn’t purely just about skill. It is also about play where bad things can happen to characters because there are dangerous environments. Character death is a real possibility and it can happen with the luck of the draw sometimes. A lot of what players are doing is hedging their betsSure, but if a GM chooses not to telegraph, what skill are you measuring? Isn't the telegraphing of danger serving the purpose to see how the players prepare themselves for the indicated danger?
If you take away the telegraphed info, then what's left?
It depends on the situation but if you don’t telegraph, they have to go by whatever else remains or cautiously Q&A some more. if it is the cliff face example, and there is a coating making it slick that isn’t instantly visible. The players may need to do something like closely examine the cliff face or even touch it to get that info. And there may even be situations where they still can’t get information about the danger (i.e. perhaps there is a magical effect and they don’t have detect magic). Still it is on the player to understand even a safe looking cliff, could he dangerous. Part of what makes this style of play fun is the potential lethality. And that can arise from hidden dangers