Two shields vs two walls -- what's the difference?

One of the major complaints about 6v6 was the double shield tanks which made it hard to win any fights and getting anywhere. Now in 5v5, we instead have one Mei wall and one Hazard wall -- which in my opinion is even worse since they can 100% completely block one or two entrances.

So it seems like we've come full circle. Blizzard replaces one "bad" thing from the past with another.