Lol, you admit to staying away from the other players while fighting a Bearded Devil? By not staying in a group with them, you are greatly reducing the effectiveness of your team. That's one of the reason that ranged players get a bad reputation.
Newsflash: When fighting Bearded Devils, everyone should condense onto one point.
They could, but an accurate assessment of that topic would make ranged combat look worse, so to be generous it can be left out.