Just one more example
In minesweeper you can click on a field in a corner that's surrounded by 1's and "die". What's different about this or do you think there should be a death warning, too?
I didn't want to continue this argument, but I'll answer this:
The point I made earlier is that this comparison doesn't quite work, due to the aims of Minesweeper and its intended challenges, as opposed to DD and its own intended challenges.
Minesweeper is a game where, inherently, the challenge and entire point is deducing where bombs are based on the numeric clues given to you. Being given a warning that you're about to step on a bomb defeats the entire purpose of the game. Stepping on a square surrounded by 1's is stupid, but fits within the game's logic: if you were unable to deduce from the clues that there was a bomb there, you lose. If someone steps into a mine that the clues would logically point to there being a mine present, then that is a failure of the player on a level of -skill-, where he failed to deduce the location of the bomb present (or made a guess and failed.)
This is -not- true in DD. There is no deduction of "is this enemy going to kill me?" because the game flatly tells you that he will, information that a game like Minesweeper does not provide you with. There is no logical reason why a player would choose to attack an enemy when the prediction tells you flat-out that you will perish, unless you're hoping for a lucky dodge or you know you've lost and you've been cut off from the dungeon entrance. Again, this is unlike Minesweeper, where a player may have a reason to choose a tile, even if it is merely because he failed to logically deduce that a mine is indeed in the tile.
Or, to put it all more simply: A death warning makes no sense in Minesweeper because the entire point of the game is to avoid stepping on the mine tiles. This is in contrast with DD, where you're never put into a position where you have to make a guess or make a deduction on whether an action will kill you or not: you are always armed with this information. It is, essentially, the difference between making a "mistake" by a failure of player skill versus making a "mistake" by mere chance or a lapse of attention.
Again, I'm not arguing -for- a death warning, I just wanted to point out why it was a bad comparison. The only level that this worries me personally is how sensitive DD is to hardware failure.