Loot should not disappear after death

This is one of the worst feelings in video games I’ve experienced in many years. This game is difficult enough as it is. Which is fine, challenge is good and the sense of accomplishment is great. What is not great however is spending a long amount of time failing at a boss and learning the mechanics, finally overcoming it and defeating the boss, just to die a few seconds later to some poison puddle on the ground or an unfair ambush and losing all the loot you just worked for. Boss is dead, no reward. This is BAD. Unbelievably bad. Please fix this. Keep loot on the ground and let us go back to get it. Or send the loot to a stash tab. PLEASE.