I think it MASSIVELY reduced his utility as a support, you could save a friendly player by giving them an escape route and then closing it before enemies could follow, now even with a well planned and placed door you are exposed for a couple seconds in a wide open room while enemies are at your...
well now you cant put a door anywhere in spawn...
why not make the wall stop bullets and abilities but be able to walk through like a paradox wall because this was a massive nerf loosing the ability to move yourself and teammates into safety quickly