Bungie need a mix of both: D1's frustrations came from some people being so unlucky as to never have a powerful Exotic drop for them, while others kept getting multiples of the same one. PseudoRNG drops can be fun, but not when some people end up never getting something just because of bad PRNG. Quests take the PRNG out of the equation so anyone can get said loot if they do the quest, but Bungie could mix it up by also making random drops for those Exotics (or powerful/great Legendaries) drop from just playing other parts of the game, rather than having them all locked behind quests. The two systems should complement one another, rather than being one or the other, so that eventually everyone will be able to get all the good loot in the game, whether it's by just playing the game normally or completing a quest to get it. Maybe for certain Exotics/items that never seem to drop, the longer you go without getting said item, the more likely you will be to get a special quest to go earn that item that won't drop for you, rather than it simply being a quest everyone gets from the get-go. That way, there's still a certain PRNG element to drops, but if you're really unlucky with not ever getting certain drops, you'd have an alternate path to getting said drop which, while still PRNG, can still be earned through a random quest if you're really having a lot of trouble acquiring it. I think for a while they had something like that for Exotics in D1, but I never understood why they got rid of it: it made the Exotic feel special to get a quest geared personally to you to earn it, especially for an Exotic that you spent months hoping to have drop but never did. Also, locking things to specific quests/activities can help incentivize playing underplayed activities, but if the activities themselves aren't fun to play, no amount of loot incentive is going to make people want to grind for them, and will only cause frustration for players who simply can't stand that particular activity. Having multiple paths to getting certain items would help, but fundamentally, Bungie need to make underplayed activities more fun to play, not just lock certain loot behind it.