I think they actually tend to get rid of elemental aspected damage / resistance. Magical / Physical is more than enough, if you want to play with buffs and debuffs.
There's more to that to be useful in a party : damage mitigation, damage down of enemy, damage up of party, vuln up as we said, party buff (any stat like crit, DH, haste), agro manipulation tools, mana regen...
Adding elemental buffs just moves the problem elsewhere, you break one meta to create another.