Dear Bungie,
In my opinion I don't see the benefits of to be member of clan or alliance.
But one of this benefits could be to join a clan or alliance Squad without having this members as a friend in PSN.
It has not sense to join a clan and if you would like to play with them, you have to add them to PSN.
I think the major part of the community has the same thinking that me.
PS:
Sorry for my bad English, usually I have not to speak using this words in English
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I wish they'd at least put ur tag by ur name if nothing else.