One hit kills in general. This is to the Japanese developers especially. Most likely a boss has some type of one hit kill, that is no way easily telegraphed and it's meant to trick and catch first time players. Shinji Mikami is guilty of this especially. I hope this new game has a lot less of that bull crap. Because the first Evil Within has this problem. Or worse yet, create a boss where nearly every attack is a one hit kill. It's bullcrap difficulty, and it makes me want to play the game less. I don't care what the story justifications are for it.
Not necessarily. There are some games that still have this, but it's usually as optional difficulty.So the best game mechanic to have died is the starting over from the beginning mechanic.