Twins are divided at different times and no one knows the emotional aspects of separation. After the separation, doctors will put the twins next to each other so they can see each other. We tend to follow them up more medically than emotionally. I have some case studies in my book. I would not advocate it at all for fraternal twins.
Identical twins are a different issue.
They might enjoy it. It should not get to the point where they rely on it for attention. Maybe take the same outfit but in different colors. We compare the similarities of identical twins to fraternal twins. Genes play some role in the development of some traits.