cdflasdkesalkjfkdfkjsdajfd If you keep it locked, it's as safe as a separate user profile. But you won't be getting notifications. It's another tool, not a replacement.
And in case something goes spectacularly wrong, like someone starting a screen record on Owner, they could see what you're doing in private space, but at this point, you have other problems.
As I see it, currently user profiles have the following security related advantages:
- separate view (I think GrapheneOS mentioned they still investigate this area: accessibility apps, autofill apps, etc.)
- separate clipboard (for now, but GrapheneOS is working on disable option)
- ability to lock and still send notifications (with Graphene's forwarding)
- you can have many of them
I'll move gov-id app and phone carrier app there, as they don't need notifications, and keep it locked. Maybe separate passwords manager and notes apps, with less used, but extra valuable stuff.
From time to time GrapheneOS mentions they work on fast user profile switching, I'm still counting on this.