So to my understanding, every-time you die you permanently lose two hearts? But just one heart if you manage to find where you died. So you shouldn't die at all up until the Wither. Death seven times means you only have three hearts. Oof. How exactly am I supposed to farm Wither Skeletons with only three hearts?
But once you get the Wither, you can just keep feeding it animals to gain your hearts back? That sounds awfully easy.
Overall I disagree with what others here are saying. This is not tedious. This is game-breaking, and if it was added I would stop playing survival for good. Maybe for that, I'm a "casual", but frankly, my op, I don't give a damm.