The update made her less reliant on her team and more reliant on herself. Her new ult makes her do more damage, healing , power, and she can fly. Her team also relys on her more than before because she can rez every 30 seconds. Mercy players who are trying to get the achievement can no longer sit in a corner and wait for her team to die
Because She can't resurge 5 teamate at a time any more. Moreover, her finnal skill makes her become more invasive. However, this reduced her ability of assistant. Her original final skill become a normal skill and She can just resurge one person a time. That is not as good as before.