I would have vastly preferred they keep the healing the same, or even reduce it, but made it a higher HPS.
Like, 80 HP over 4 seconds (20 HP/s) would be vastly superior to 100 HP over 6 seconds. This would give her and her teammates a better chance of surviving incoming damage.
Her Shield Bash should also do at least 10 damage. With the current proposed changes, Brigitte needs 4 swings plus a Whip Shot to kill somebody, regardless of if she uses Shield Bash or not. A 10 damage Shield Bash would at least let using her cooldown reduce the number of swings it takes to kill somebody. As it is, Brigitte’s TTK is actually faster if she opts not to bash them, since she’s not wasting time using the bash.