I think the original use-case was delivering data for use in dashboards or other business systems, not the SCADA network in general (where you’d want write acce

I think the original use-case was delivering data for use in dashboards or other business systems, not the SCADA network in general (where you’d want write access). So, places where you might want to get read-only data from a secured system, but not allow write access. These business/reporting systems might be internet connected, hence the desire for better isolation.