Verily, I love this practice. Vote above.
When I eat with brothers or even family from the same plate, I feel such a sense of community and safety. If we are all eating from the same plate, then our concerns are also the same. All the more when we are sitting. It ensures equal distribution and that we all finish eating at the same time. If I eat more, my brother next to me will also eat more. If I eat less, then they will also eat less.
I also noticed when you say Bismillah, there is more baraka in the meal- like you can actually "feel" better through the meal, and I think thats part of what baraka entails.
Many Americans cry about the destruction of the family, the absence of the family dinner, but for us, alhamdulillah, we still have this practice alive.