Some people might not like the idea of hazards killing you, while others do. But the thing is that not all of them should kill you. The piranha in the Daxter level eating you and taking a life away would be awesome and would add intensity to the game and more specifically the level. It would be like Banjo Kazooies shark in treasure trove cove.(i think thats what its called) you can even ad a little theme song when he is about to eat you. I think that would be awesome.
I don't think there's a point to that because when you get eaten and you spawn back on the field you're stunned for a short period of time, long enough for someone to take advantage of your situation and kill you with a super so the fish killing you wouldn't make much of a difference.