The problem is Halo was a completely different beast. The shotgun wasn't something you had in your 10-gun secondary inventory slots. You had to find one, conserve it's ammo, and plan for the boss accordingly all while sacrificing one of two weapon slots for the duration. Same goes for any power weapon. This feeling is completely absent in Destiny. Heck, Halo never even had actual bosses. It had segments that would be a total bitch to do on Legendary because of the insane amount of elite enemy types, but there was usually a route and strategy that was effective but wasn't homogeneous or usable in other levels. Halo was a conventional shooter in terms of it was only an FPS. Destiny has too many RPG elements to return to that style. Instead, Bungie really should embrace the boss paradigm which comes with that: different AI packages for different bosses. And to address PoE, I was honestly hoping for a firefight mode with modifiers and bosses with unique mechanics. It shouldn't have been hard to do, but Bungie managed to include the bare minimum of that expectation to be able to make it seem like they tried to do it but failed miserably.