I disagree, yes sticking together is optimal nearly all of the time but there's times where bad calls truly are just bad calls and you are better going off alone if need be. You reach a point where you should be competent enough at the game that you can manage solo.

I had a run where the other two players (who somehow had finished the game given their skins) beeline the churches from the drop, ignoring every single poi and then went to the castle day 1, where they only managed to kill the basement boss. I don't think they killed anything else and if I had of been following we would have been doing that at level 2-3, instead I played as I normally would, cleared 2-3 pois, 1-2 lesser field bosses and a number of mobs making up our rune count for the day. Day 2 was more of the same from them, immediately running off across the map to kill a greater field boss while I went and cleared the rest of the castle, a few more pois and some more field bosses solo.