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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... And manual cars are fun and a much better experience than automatic cars with fake paddle shifting. But who cares. You can whine about the past and complain about the present or just get with the program. That's all there is to it.