Random death comes under "2) ... drain resources ...".
Also, as
@overgeeked noted, you need to approach a funnel as a rogue-like - the whole point is to see how far your characters get before they die, on
the built-in assumption that yes, they're all gonna die. And then, if one or two manage to survive anyway, it's a win!
Going in on the assumption that your character(s) will survive is the wrong approach; and I posit that D&D in all versions would be better were this assumption also made redundant there.