Frid comes from a server where all warriors are expected to be tanks. He has never seen what a full dps warrior can do so you will have to excuse his ignorance on the matter.
I know how to lock bosses, using 15 pures on a toon that wont ever be in lock group without that gear isn't worth it in my world.
Idk why ppl says that dg on mage and druid is bad..
I didn't say it's bad. Nobody has said it's bad. DG is quite clearly the best armour for every toon (except tanks).
As for Druid and Mages, I think they're both important to gear...aura will cut down on amount of Druids needed and as someone said earlier, the dmg boosts helps a lot on Gele crystals, but nothing will rival a ranger at end game so if you're gearing to win locks then definitely gear rangers and rogues for locking the bosses like Proteus, Necro and Mordris. Otherwise, all classes are benefiting from the aura at raids if you focus on improving dps as a whole and not just an 8 person lock group.
I'm happy for you that your server has little to no competition, sadly not everyone has such a dominant position in their respective worlds.
Oderint Dum Metuant.