One of the reasons it took us so long to do it was because there wasn't really any other way to discover what bosses did besides going in there and dying to him repeatedly. Boss kill vids were in their infancy, and there weren't many places to go to get ideas on how other guilds got past X or Y. Our big stumbling block was the stream of adds before Nefarian landed; we kept trying to tank them, before someone got the bright idea of using warlocks and mages to AOE them in place.
Over the years, the playerbase has built up an impressive array of options for boss fight information. Soon, the Encounter Journal will go one step beyond and incorporate loot drop and boss ability information into the game. It won't tell you how to fight a boss, but it will tell you what the boss can do to you.