I’m marking this proposal as rejected for now since a lot of people are likely not using Android 15 at this moment.
Android 15 has not yet been released on the stable channel for GrapheneOS at the time I’m writing this.
We can always revisit this whenever there’s a critical mass of Android 15 users, as @sgp noted.
In the meantime, I opened a PR to add an introduction to the Shelter card which provides a reason for using a private space over Shelter if the former is available.
As always, any feedback regarding the language on the Shelter card is welcome.
Side note
The above PR is currently marked as draft since I’m currently waiting for Android 15 to reach the stable channel for GrapheneOS so that I can test the Private Space feature and write about it. However, if you have already tested Private Space and wish to contribute to the Android Overview page, feel free to open a Site Development thread or offer feedback on GitHub directly!