Hey @ta-aoki -
That is the case right now. Having said that, once a widget is created any app editor user can use it. This was an intentional home just for the time being until we can build more governance around user management and rights. There is work going on to improve how user roles can be managed and custom widget will be part of the feature set that can be assigned/unassigned to any role. This work is just starting, so I wouldn’t expect this to change in the next quarter.
Pete