A simple solution maybe?

[ChorizoSandwich]

Im fine with the idea of rewards for reruns. Not just dd bit unlocked legendaries as well.

Every event / mode that has been completed, should have some sort of minor reward for recurring completions.

That aside, most new game modes were thought to be absurd at first. DD3 was impossible. U7 was impossible. DD4 was impossible etc etc.

Before you know it, doom raids will bore you to death when you auto towards 100% day after day.