Ive been saying it here on the forums.
The problem is not Sombra. It was Sigma.
BTW, this is not a buf on Sombra. Sombra still seems balanced so far, until they nerf all OP heros then this will become more apparent .
This is a nerf on OP Sigma, but its a logical nerf due to his barrier really not being a stationary barrier, its more like a projection from his suit or something.