In real life, not every reservoir behaves the same, so why force them into one model?
In this case, an EOS-based reservoir is coupled with a Black-Oil reservoir and an EOS surface network allowing each asset to be modelled at the right level of physics. The integration removes a lot of manual back and forth, makes constraints visible, and shows what the system can deliver. It is about spending less time reconciling models and more time making confident production decisions.