I’d say at this point its pretty clear Brigitte’s initial balance was pretty far off the mark. She has been nerfed multiple times since then and she is still very strong.
Another regret is although I really like the way Hanzo has turned out, I somewhat regret increasing his projectile speed specifically. It will always feel great when testing a change like that, and it has helped make him a lot more consistent… but he has lost some of what helped make him feel very different than other heroes. That’s not to say you’re going to see Hanzo nerfed next patch or something, but its just one of those retrospect things that I wonder if there was another way to get to the same goal.