Originally Posted by
Tharkkun
Unless you know exactly what addons they are using it's hard to tell if they are using all the tools available. I found a warlock last expansion who had horrid dps. He had never used a dot timer once. He just guessed and fired. He had DBM installed but the bars weren't in a place he could see so he ignored them.
These are terrible examples of a raider applying to a high level guild but it shows how different players are. Standardizing on a default UI guaranteeing that everyone sees the same data isn't the worst thing.