In the past, if someone accidentally looted something they didn’t mean to in a group, players would have to contact customer support to trade it. In the modern system, players are given a period of time in which they can still exchange loot with others. This is a convenience we felt was worth retaining for Classic rather than making people go through customer support. (Sorry ninja looters!)
The original animations have also been restored, but WoW’s animation system is tightly coupled with its gameplay code. We had to make changes to both data and code to get the animations back to the 1.12 look. We ran into a few bugs along the way, such as models that should appear prone instead appearing upright, but we were able to correct these with a few fixes.
Wait, /sit to trigger crits is p-server thing? I distinctly remember people saying that if you sit, you will be crit when I played 1.12 Vanilla. On top of that - there’s that pally that one shot Kazzak in early Vanilla because he stacked a shitload of reckoning when it didn’t have a limit - it’s not inconceivable that he did it without /sit to trigger crits, but it would take him so, SO long to do that without /sit.