I plan and run video programs for brands and creators. Over the past 4 years I grew a food channel from 40K to 1.2M subscribers and cut average production cost per video by 31%. I care about retention graphs more than thumbnails, though I will still argue about a thumbnail for an hour.
I plan video programs end to end: format, cadence, editing standards, and the metrics that tell me whether any of it worked. Most of my time goes to the two minutes after someone clicks play.