Every shoppable video app shows you the same polished demo reel.
Video apps vary enormously in page-weight cost, and that cost is paid on every page view whether or not anyone presses play.
Format coverage matters more than feature count — carousels, stories, grids and popups each do a different job at a different point in the journey.
Importing existing Reels and TikTok content is the fastest path to a populated feed, so import tooling is worth more than production features for most stores.
Test on your own theme and measure Core Web Vitals before and after, because vendor demo stores are optimised in ways yours is not.
Some do, substantially. The determining factor is whether the app loads its player and video assets on page load or only on interaction.
The full guide has the formats, the deadlines and the worked examples.