The only items "earned" in Destiny are items with specific criteria for attaining them. Such as exotic bounties, Iron Banner gear, Murmur etc ... Everything else is dropped by a programming algorithm, otherwise known as "luck".
Case in point. I have played almost 400 hours and have beaten both Raids repeatedly as well as lots of Nightfalls and I've never gotten a Gjallerhorn. I barely play PvP and scored a Suros off a random match reward. No rhyme or reason. Just "luck".
If you think you "earned" a random drop, get off your high horse and join reality with the rest of us.
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Despite the RNG involved, I'd still classify the raid Exotic weapons as earned as well, since you have to beat the thing on hard to get them. Other than that, agreed.