Talk:Starlight Glimmer/@comment-1031724-20180130103149/@comment-4531340-20180225082918

Yeah, that's a good in-universe explanation - the out of universe explanation is probably more along the lines of "the movie and season 5 were started at around the same time" - so by the time it was known Starlight would be a recurring character in the series, and what her personality/role would be, it was too late to write her in to the movie in a way that would work.