GOATS and double shield were not a 6v6 problem, it was a balance problem. IDK why you and others keep saying this. The devs must really have you fooled.
Double barrier and the ability to run triple tank triple healer existed in the game for literally years in OW1/6v6 and was never a problem because the game was still balanced. It was horrible design and balance decisions like brig and sigma that created these issues.
If you think double barrier was an issue with 6v6, can you tell me why Rein+Orisa was never a problem?