For most of the last decade, vertical video was treated as a concession. Brands shot horizontal, the way television and cinema taught us to, and adapted for mobile as an afterthought: cropping, letterboxing, hoping the important parts survived the reformat. That logic made sense in 2016. It doesn't hold anymore. The screen that most people are holding right now is vertical. The platforms where attention lives — Instagram Reels, TikTok, YouTube Shorts — are built around that o