It's important to note that user profiles are a standard Android feature, as are Private Space and work profiles nested within the Owner user. None of the core privacy and security features of GrapheneOS require using user profiles. We make certain enhancements to user profiles and Private Space. For user profiles, that's mainly allowing making more users, using more standard functionality (end session, more toggles to control access) and notification forwarding. For Private Space, we enable using them in secondary users and provide the important improvement of controlling clipboard sharing with the parent profile. Those profile improvements are a very tiny portion of what GrapheneOS provides. There's a common misconception that sandboxed Google Play requires profiles but that's not the case and they're regular sandboxed apps when installed in the Owner user too.