Private Space is very similar to a user profile but nested inside of another user. GrapheneOS adds shared clipboard control for Private Space which was the main disadvantage compared to a secondary user.

GrapheneOS supports having a Private Space in secondary users instead of only a single one in Owner. Supporting multiple Private Spaces per user is a planned feature at which point work profiles will be fully obsolete. The remaining use case for work profiles is to have both a Private Space and work profile in the Owner user.