D1 had a system where they followed an "under-suit" sort of like Halo I guess? Where they would be able to add armor that looks not too visually different like D2 but can look rather unique while also preventing clipping with other armor pieces in most instances. That and they followed similar design to the armor so each class was always distinct. Now in D2 I feel like they fired 90% of their artists as they don't really bother anymore. Lots of armor clips through each other, many hunter cloaks have a floating front part and the Iron Banner hunter cloak when you have your helmet off doesn't lower the wolf pelt hood it just disappears entirely. They then also listened to people complaining about similar looking armor and so have gone to making every set vastly different which means mixing and matching in 99.99% of instances will never create a cohesive look. If you were a brand new player looking at the Lightfall destination armor you probably couldn't tell which class is which because all 3 look the exact same pretty much. If you even look at November Hotel's video about D1 graphics compared to D2 disregarding his whole "D1 was better" -blam!- you can see clear as day how much more effort was put into the details and effects of the environments of D1 and then in D2 it all looks flat and muted. Lest we forget the half finished cosmodrome that doesn't even have a day and night cycle.