Answer:
Some positives of having a social structure could be that everyone will have a set status that is unchanging, and essentially everyone has their specialty because that is part of their "class," and they have never known anything different. A huge negative of the social structure is the fact that their status was unchanging and people were defined by their status. This could cause some segregation between classes, causing many to feel alienated / looked down upon over something that they could not change.
I really hope this helps, I tried to go into detail more but because I do not know the full context of the question, I could not fully explain my thoughts :)