It's just going to be doing the highest gr tier your group can do effectively, people won't necessarily be using xp gear anymore so they will try to gear their characters as best they can to farm the highest gr's they can without the risk of "failing" a gr. I think groups will still be using a support barb to provide ignore pain and some pulling/crowd control abilities along with other group buffs.
0
It's just going to be doing the highest gr tier your group can do effectively, people won't necessarily be using xp gear anymore so they will try to gear their characters as best they can to farm the highest gr's they can without the risk of "failing" a gr. I think groups will still be using a support barb to provide ignore pain and some pulling/crowd control abilities along with other group buffs.