I believe that some good ways to make brig more fair only needs 2 changes.
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Brig has her 50 damage shield bash but her shield breaks on impact and she cant go through barriers.
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Inspire healing stays the same but she cant heal herself.
I believe this would help as Brig already has the highest health out of any support and her self healing is a bit too strong in my opinion. Her shield breaking on impact would also make her weaker therefore needing more teamplay to stun someone and not die.