D1 Crucible was for the skilled. A fun and complex movement system, quick killing weapons that would punish those who didn't have good aim. D1 crucible was mostly 6v6 and 3v3. The TTK was low so that if your enemies were bad enough you could wipe all of them off the field simply with your aim. However, in D2 that's just not possible. The high TTK of the weapons in D2 require a teamshotting playstyle, because otherwise before you can kill one enemy you will be pelted to death by 4x as many bullets.
You could say that teamshotting was possible in D1 but it just didn't work that way for a myriad of reasons.
#1: Supers were much more frequent, staying close to eachother gave the enemy a huge advantage allowing them to get far more bang for their buck.
#2: Grenades were much more frequent and deadly. One skillfully placed tripmine could kill an entire team if they were too close to eachother (I've seen this happen a couple of times personally).
#3: Heavy ammo dropped for EVERYONE and you were able to pickup enemy heavy that was lost when they died. Proximity detonated rocket launchers meant nobody wanted to be close to a teammate.
#4: Map's were larger and had better sight lines which meant that staying in a pile would likely have yourself shot from all angles.
#5: Low TTK
All of these things are what made Destiny 1 crucible have the playstyle that it did. Without these things we wouldn't have the same crucible we all know and love. And unfortunately we see what that looks like. It looks like Destiny 2's crucible. A bland, uninteresting, un-fun wasteland of teamshotting where the skill required is minimal.
And for those who may doubt my skill I have roughly a 1.83 in Trials Of The Nine and 21x Flawlesses.
By no means is that amazing, but its good enough so as you know I am no scrub.
EDIT: I have not played Destiny 1, Year 3. I played on a "legacy console" so I couldn't play year 3. And although I could have repurchased the game which was 2/3's through its life cycle, I didn't think it was worth it.
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You didn’t play yr3? So you really don’t know how bad PvP got trying to even things out due to community complaints and wants as well as community abuse of tactics and items. Things people were the most tired of have been removed. Easy mode ones shot weapons on spawn, ability spam (stickies & Nightstalker “wombo combo” etc), heavy for everyone leading to a -blam!- session for the other team. We did this to ourselves through direct and indirect feedback. It’s one of those things where if it was to your advantage you loved it. But if it wasn’t you hated it. Community wanted more gunplay and less spam and one shot items. We got it. Are there still other issues, yes. But at least in this meta I don’t feel like some bum got the better of me just because they were hiding with a shotgun (which in most games is a power weapon pick up due to its one hit ability) or had a stickie ready every 25 seconds. I usually got outshot or out maneuvered. I’d rather that happen than what used to before. It’s not for everyone and that’s fine.