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I was commenting on a WvW and it got me thinking about did GW2 actually take out the Trinity system? Here is my logic. Sure you are not locked into a certain roll but when you look at it the rolls are still there in their tried and true forms. There is still a aggro system where someone is tanking, you still have hps that go down and you or your group use skills to heal you back up when you get low and you still do damage to monsters. So although you can choose if your char is in a current build for tank/healer/dps those are still your options and are used in almost every single fight.
This got me thinking what would it take for a MMO to truly break the mold of the Trinity? Well instead of giving people open options within the Trinity setup(which is what I feel GW2 has done) you would have to actually get rid of one of the 3 parts of it. Damage is pretty much impossible to get rid of so that leaves you with Tank/Healer. In theory you could get rid of the tanking system. You would have to have a combat system that had no aggro where the mobs either attacked at random or everything was AOE damage that affected the whole group. Although doable I doubt this would be very easy and I'm not sure it could be pulled off with success. The second way and the way I think it would have to be done if a MMO truly got rid of the Trinity system would be for healing to go away. You enter a fight with 1000 hp and you have to find a way to finish it before you get to 0. Instead the object would be to use maybe buff abilites that lessen damage at the right time like just before a big attack or use evades to evade the big attacks. This would also add the element of changing aggro if one member of the team gets low on hp instead of having a way to bring them back to full he would have to lose aggro and let a teammate take over and the goal would be to kill the mob before you run out of people and die.
Would a setup like this work? Maybe and Maybe not but I'm not willing to say there is no Trinity in GW2 it is just a altered Trinity setup. Until something comes out with a system that takes out one part of the trinity the Trinity is still running strong in my book. This is not to say GW2 is not a good or even great game just that in the terms of how combat works it did not revolutionize anything. Still tank/still heal/still do dps.