With respect, I have to disagree with this idea. To some degree, yes, it would make fights harder. But I think there would be other side effects that are bad for the game.

1) It doesn't increase the difficulty of the content for the actual people who screw up mechanics and die. They simply... stop participating. And they sit there watching other people play for several minutes, not practicing and not learning the fight.

2) It will make fights drag on and on if multiple people die.

3) As you say, it will provoke animosity between players, and not just healers. People will get annoyed at people who die, as it makes their fight last longer. Players will fight over whether or not to wipe the whole group if too many are on the ground, some will intentionally kill themself just to force it. People will kick players who die, and more people will just leave and not want to play the game at all.

4) We will pretty much never be able to clear a Nier raid ever again, but even if it does it will take 80 minutes depending how many deaths there are along the way. And that's if enough people stick around to even bother trying. I think a lot would instantly leave as soon as roulette plops them in there.

5) An individual player can do everything perfectly and still die. People can accidentally pile on top of you with multiple AoE markers, or you get randomly marked with a stack marker and not enough people make it to you in time. Or a noob tank spins the boss around and cleaves a bunch of people. Now, you might say "It will force that tank to learn." Uh, no it won't. If they don't learn from all the people yelling at them to stop spinning the boss, then getting some people killed isn't gonna do it either.

This is just off the top of my head, I'm sure there are more reasons to be found. But also, I'll say that we do have things like Vulnerability stacks and resurrection debuffs to somewhat punish failure. I could see the argument that maybe that's not enough to make an impact and make people want to perform better, but I don't think getting rid of battle Raise is the answer we need.