Imagine a repeatable quest that ran you through some random minor objectives (kill enemies with grenades, get slam kills, kill certain enemy types, loot red chests, etc.) followed by some random mini bosses, culminating in a random boss fight. You wouldn’t know which mini bosses or main bosses you would get until you achieved the prerequisite goals in the quest. You could navigate the game world yourself like an MMO fetch quest, it wouldn’t need to be a specific dungeon like the Diablo 3 rift.
If you combined this with a large enough Luck multiplier (perhaps even like a pinball machine that you could watch increase as you went through the quest), and maybe some exclusive or guaranteed anointed loot (maybe even a new currency that could be spent on unique stuff), this repeatable randomized end game quest could compete with single boss rinse and repeat farming as the best use of time endgame activity.
This would greatly enhance my end game play experience. Walking my through this great big game world, and requiring me to use all of its mechanics in order to achieve the highest levels of loot gathering, would add a variety of game play that I feel silly doing on my own because of the sheer efficiency of rinse and repeat farming.
Diablo 3 rifts are a blast, but obviously can’t directly translate to Borderlands 3 because the level assets aren’t nearly as linear. This kind of quest doesn’t seem too difficult to implement from a laymen’s perspective and would capture the essence of the rift game-play loop in an MMO kind of way.