@vengu I didn't see those posts before. Reading "progression / re-building" coming from Prometheus eases my mind since they plan to have progression in mind.
About build uniqueness I think we will have to wait until it's released and hope for it to not become the famous 4-man party with 2 dps, 1 tank, 1 healer with all of those always using the same skills since they are just better than everything else.