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The big one for me is raid frames...the original CT_RA had to pass player information between clients via a custom channel because there was no other way to get it if you weren't in a player's group.
A very large part of the default UI changes since even before 2.0 have been based on addons. Not that I actually think that that is bad. Obviously Bliz didn't use addon code (and you could easily see if they had); so unless you're a supporter of software patents (which I at least am not), they are and *should* be allowed to implement those ideas on their own.
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