Here is an example of scenarios one can have with Flags. This was available for Canary & Dev. It is available for Beta. (But) It is, now, gone, no longer offered or working for Canary or Dev. Flags can come & go. They are 'lab rats', guinea pigs not, permanent or supported solutions.
Thank you, Drew. This is an important point. All flags are temporary overrides that allow us to test things before they end up in the Beta and Stable channels. We will add settings if there is a customer desire to be able to enable or disable a given feature. Thanks - Elliot