A lot of great progress has been made by Roblox with recent analytic upgrades for developers. However, one outdated feature is the thumbnail length.
30 second video thumbnails are very limiting, and while they served their purpose well when they were first introduced years ago, the environment in which Roblox is now in (a serious game development platform with countless studios of full-time employees), the restriction to keeping video thumbnails to 30 second max is fairly inferior to other platforms.
Perhaps even rolling out the feature first to verified users or verified groups, where new video thumbnails can be, at a new maximum, one minute or even one minute thirty seconds, would give developers much more time to properly showcase their game and what it has to offer. With increasingly complex experiences being created daily, it is becoming more difficult to showcase all of the content the game offers within 30 seconds.