MicrosoftWith Intune all apps are essentially online, the difference in context of Intune/MSfB is online/offline only affects the servicing. The current version of the app is still pulled from the internet during installation. Offline can be recommended as they can be deployed to the device instead of user which makes them work more reliability in some scenarios.
I will say that MS did an appalling job of explaining this. Intune managed (Offline)/Store managed (Online) would explain it better. The app still gets updates, however via a different mechanism
https://learn.microsoft.com/en-us/mem/intune/apps/store-apps-company-portal-autopilot
WSfB does let you download a properly offline specific licensed copy of the app installer, which could be deployed independently but that is something different
