Let's take a look a movie's development process for a moment. I'm pretty sure we all can agree a video game needs more development time than your average blockbuster. So lets dive into the process of one of the best animated movie studios of all time, Pixar. Now to make your run of the mill Toy Story or Up or even Wall-E you have tons of employees each working in a team to handle specific tasks. you have several teams working on concept art, several teams working on story boards, and there are several scripts written up. each of these groups working nearly simultaneously. That's pre-production.
then after pre-production is squared away then you get your voice actors in, do a couple days of recording and bam, that's the end of the linear production. then you take the approved story board, character designs and recordings and give them to dozens upon dozens of animators to work on 1-2 scenes. The whole movie strung along piece by piece but at each animators pace with the particular piece of work they were given. just because Joe is working of the not so funny after credit scene, he isn't effecting Sarah's touching emotional scene, or henry's climatic ending, or Megan's witty banter scene. And the director isn't always watching over their shoulder as they make it, he'll probably walk in a couple times, give a tweak or two before and after the scene is finished. Other teams are also working at this time too, like the dvd menu guys, or the awful in dvd game guys, the sound guys, the orchestra, SO much is delegated to different groups of people to ensure that no one scene, or sound or menu gets any lack of attention. Heck they even delegate things like 'lighting' & 'textures' to different companies that specialize in that particular animation field.
So take Smash 4, and I guarantee that there was more than a handful of guys working on everything on their own. So while its easy to rage about a game mode and easy to blame this mode on the fact your favorite brawl character didnt make the character roster, the fact of the matter is, its not Smash Tours fault that
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aren't in the game. That was most probably a Directorial decision that took place during the pre-production phase, or somewhere mid way through.