Probably because Destiny never intended to focus on RPG much? Btw, The Division isn't really an RPG either. Both games have RPG elements - just like pretty much every game nowadays has some RPG elemtents in it. Division is certainly more focused on RPG than Destiny is, at least from a skill/talent point of view. That doesn't make it a true RPG though.
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The Division is an Action RPG in the vein of games like Borderlands and Diablo 3. So is Destiny. It's just not a very good one.