Traditionally in MMOs, you join a clan or guild to share resources and strategies plus show who your friendlies are. As there is not clan vault or player trading of any kind along with there looking to be no conquering of virtual territory, what is the basic purpose behinds clans in Destiny? You don't need a clan to squad up and go on raids as you can just use your gaming network's friends list and and PVP is so simple it doesn't care what clan you're in. I am not talking trash or trying to start an argument; I am just trying to get some info.
For people like me whose friends are still on the previous gen consoles, and have not and/or dont plan on getting destiny, clans are a good way to find reliable, active players to party up with for strikes, raids, etc.