Ability to Automatically add the captions within the exported video. To save a step of exporting the video, then exporting the caption file, then layering in Premiere and exporting.
If we're using it to export final media, here are some of the refining options I'd like, as long as we're opening Pandora's Box: ability to adjust timing of the captions for when Descript doesn't get it *quite* right; ability to change how Descript breaks up the captions for better readability; ability to adjust style/font/color/background etc.
(And for those still layering in Premiere, I use a single-purpose tool called Submerge that I think is a bit easier and faster for this kind of thing; easy to give an intern or AE for burning in captions.)
To me, this is a no brainer!! Go Descript, Go!!