The first movie did not do any real world building and a lot of the story elements and scenes just seemed like randomly pieced together separate pre-viz shots. No reason why this wouldn't work for a Warcraft movie. Star was has some of if not the richest lore out there, the movies present none of it, just basic ideas that are needed for those movies to function, if you wanna delve in the lore there are books, games etc. No good movie explains everything about it's world just in that movie. If you go into full detail what point is there for them to do that, they already know all the backstory. If you don't explain everything it's also great, because you get viewers interested in doing some research on their own, maybe even get them interested to play the games themselves, leading up to WoW ofc. You can completely explain it in the first movie. The orcs you fight in there aren't thrall's orcs, those already left for kalimdor. That's what you don't understand, you need no prior knowledge for the Human campaign, because it's 100% self contained. I literally can't understand this massive bone for arthas, but to everyone who don't play wow he is a nobody and people will just see him as a Darth Vader prototype without a proper set up, fucker is not even the main character or the most important event of wc3, let alone a movie to build up an universe.Guess what, he's nobody to anyone when they play War 3 for the first time, he still became arguably the best character in the franchise. Even the human campaign need the orcish prologue to set up things with the horde x alliance dillema, you would do the same exactly mistake they did with the movie throwing shit without a proper explanation or build up, a game is different than a movie, you can pause, you spend time, you read about things and etc

Warcraft 2 release date movie