The playerbase as a whole is (understandably) afraid of wiping and having to press that return to start button, so SE has to cater content with a participation trophy mentality where barring the most serious of mistakes it's very hard to actually wipe to things and simply showing up and pressing buttons gets you a clear.

Even with situations where there are 6 people dead except the tank and the healer, it's there isn't much danger of wiping, the only danger is having to collect dust on the floor while the healer raises people 1 by 1, and by that point you're probably tabbed out wondering if you'll be dead last on the rezzing queue, plus the aforementioned situation rarely happens since there's so few normal mode mechanics that actually carry any risk of killing a single person, let alone 6.