WvWvW or PvP and its updates
Your mixing “reward” with “gameplay”.
For example, what if everyone was just straight up level 80 right away? No going from 1 to 79, you was just instantly given 80.
Well, people would enjoy the dynamic events for awhile, but eventually they would ask and say.. “whats the point?”
Thats where the rewards come in. When Arena net said they got rid of grinding, they got rid of grinding LEVELS, they said nothing about not grinding for rewards, which is inevitable, because if everything is handed to you on a silver platter, you lose all sense of achievement and progression, and you would have no economy to boot.
By grinding out for GOOD rewards, you essentially keep the game going. Just because they have anti-grind philosophy doesn’t mean they are completely against grinding. Grinding is good in much like one exercises to achieve quality health. But to grind to gain 1 level that has no impact on gameplay is just tedious.