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While I agree there could be a better system implemented, think about this if you're typing in a name instead of sending it that leaves room for error and the potential to get someone else's username by mistake(if you accidentally mistype a friend code you get gibberish that accomplishes nothing), and if you're sending it, then anybody could send someone a friend request with malcontent in mind. You basically have to make the effort to give it to a friend personally or go out of your way to leave it out in the open for anyone to see, in which case you already know what risk you're putting yourself in. Not something that wouldn't happen more often with username, especially if it's the same name that end up on leader boards, forums, and achievement list... Or at least, that was my take on the situtation. I have been known to be wrong from time to time.