Totally get your frustration, folks! Apologies for the confusion.
To clarify, we’ve transitioned to a much more robust architecture. If you’d like to start/stop apps via command line, you can do the following:
Stop an app:
umbreld client apps.stop.mutate --appId <app-id>
Example:
umbreld client apps.stop.mutate --appId bitcoin
And start it with:
umbreld client apps.restart.mutate --appId <app-id>