I dont think your are supposed to unlock all of them. Honestly it doesn't even matter. Is a visual nothing to do with gameplay.
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People can ask for what ever they want. It takes time a resources to build this systems. So yes they need to make up for that. Bungie is a Business not a charity. At the end of the the day your are free to choose wether you grind or pay. Im interested in about 3 sets for each character sooo, yea im not bothered at all since 6 already came with the season pass.