This!
Seriously, the biggest annoyance as a WoW palyer who uses a totally custom UI (no unnecessary Blizzard frames) is the, up until 37 minutes from now, lack of UI customization. Guaranteed my playtime tomorrow involves 2 hours of screwing around with UI elements. OCD ftw!
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They say a man should always dress for the job he wants
So why'm I dressed up like a pirate in this restaurant?
It's all because some hacker stole my identity
Now I'm in here every evening serving chowder and iced tea!