You have the same misconception like many people on this forums..mixing up the fantasy and fable...the first one have rules (hell, sometimes even magic have scientific approach) usually those general rules, laws are the same like our real Earth (gravity, breeding, life support requirements (not specified, but usually oxygen, water, food) the races are bipedal humanoids most of the time (in western fantasy at least..in eastern...bit different) etc.) The fantasy world have it`s own background (May i suggest Raymond E. Feist Riftwar series? One of the best fantasy books ever...and ofc the rest of his bibliography
Or David Gemmel and his Drenai Series? Another masterpiece especially the Waylander arc)
In fables anything might happen without any logical explanation, no background for the "world", no deeper connection with anything.....
World of Warcraft started long time ago as fantasy world with rich background informations ..nowadays reminds me the lowest quality fables.....