Compare the arsenal from vanilla Destiny to what we got with the expansions. It was considerably more powerful and left little room to progress. Where do you go from Fatebringer? What improves it? We had high rate of fire, high impact, easy to handle assault rifles. Fusion rifles that could one-shot across the map. An exotic weapon so good it made all others redundant. Weapons with little to no weakness and no interesting choices in build - just a few no brainer loadouts. In the DLCs Bungie started to introduce weapons with pros and cons, but we already had better gear and there was little incentive to upgrade. And this is where we are now. Say in TTK we get bring all our weapons forward - what would you be after? There's very little I would want/need to replace. And this is because the initial year 1 weapons were simply too damn good. The only incentive to upgrade would be to give us even more powerful guns, which would bork the game even more. Be it in raw power, utility or both - every gun should have a strength and a weakness. Sure, exotics with more pro than con to them are fine - they have to earn their slot - but even these shouldn't be god tier, do everything solutions (looking at you, ghorn). If you look at how Bungie have changed perks and weapons recently you can see this is the direction they're heading and if we want to have interesting load out choices and for Destiny to be scalable in gear progression, a clean slate is the only way forward. So there - suck it up Guardian.