User blog comment:SomeoneYouUsedToKnow/SYUTK's V5E5 - χeep μoving φorward - Impressions/Recap/@comment-34633327-20171116065223/@comment-4010415-20171116070241

I think they chose the movie formatting because that's how they've done Red vs Blue since its beginning, which made sense for RvB, since that show had reeeeally short episodes early on. When released on DVD, they decided to have each season be a movie. So, that's what they're doing with RWBY too.