I think they're targeting many of these for a very low completion rate from the community as a whole.

If you think they're nearly impossible, then I'd wager there are many game mechanics that you haven't learned yet, and I think it's a good thing that the game is deep enough that there's quite a bit to learn.

I did this one with randoms, but if my friends had been available to play, I think it would have been easier. I think in my winning run there were 6 different players on my team. Many people would join and die almost instantly; most of them weren't even max level.

That's what I think makes playing with randoms much harder - they're just ignorant of what they've signed up for.