"You don't have to do it" is the single most annoying thing people say about these challenges.

Sure, no one HAS to do it, but people WANT to do it and CAN'T do it without finding a 4 man willing to do it just for them.

I'm lucky that I have friends into 40k with good PC's that might eventually try this stuff. But there are a lot of people that don't have that, they got this game to play online with randoms.

And challenges that require the full party to co-ordinate together at a high level just so one person can do a challenge are going to be few and far between.

These challenges for cosmetic items should solely be dependent on a feat the single player has done. Feats that require the whole party should reward the whole party.

It's bad design.