I think everyone saw the PTR notes by now. If not:
This was the nerf they had to do all this time. Brigitte shouldn’t have so much damage right from the start. Killing potential and the combo were the problems with her.
However, they have done many unnecesary nerfs so far. They nerfed her survivability and her utility, which were never the problem. If the passive buff is not enough, they should revert her barrier back to 600.
The goal for brigitte is to make her a healer/tank hybrid with some disruptive options. High damage, Insta-killing tracer, or on the other hand, making her F-tier should be avoided.
(The passive buff might be strong if you manage to stack it though, I want to see how it will work in the PTR)