Whoever the fuck decided that loot driven games need to have repetitive mission design with a complete lack of story can go to hell.
Everyone has kind of just accepted it's got to be that way, whether it's the multiple failed MMO attempts that just cloned WoW in this regard. Or something like destiny which could have easily kept all it's loot/grind mechanics intact and ALSO provide some compelling mission design and story. They fucking did it with the Halo series, it's not as if they aren't capable.
I am completely perplexed, it's almost like they have done it deliberately, it's as if they say "o hey this is a loot driven game, so we don't need to make any other components compelling." What a terrible waste of an opportunity to make something with the best of all worlds.
Have they done some sort of personality testing to say that people who like one aspect ignore another? Because that's certainly not the case for me.
I still hold out that one day someone can merge the way these genres work without compromising so hard on either, there is no magical reason it's not possible.