It's important to note that --force is needed in circumstances where one of the controllers is killed or firewalled off or otherwise disconnected so that things cannot be torn down cleanly. But a normal remove-relation or destroy-model where everything is still connected should work without --force.
It's important to note that --force is needed in circumstances where one of the controllers is killed or firewalled off or otherwise disconnected so that things cannot be torn down cleanly. But a normal remove-relation or destroy-model where everything is still connected should work without --force.