Roblox is not just a game engine, it is a platform. Only one version of the engine can be online at a time, unlike other engines where developers can simply use an older version if they have any problems with an update. It may be “odd”, but it’s a necessity. A/B tests shouldn’t be noticeable most of the time anyway, 99% of the obvious FFlags will never even get an Announcement or bullet point in a Release Notes because they are just code maintenance.