docs/lbi: Note non-support of "rootless"

Point to the podman discussion about `--userns=auto` instead.

docs/src/experimental-logically-bound-images.md

@@ -76,6 +76,12 @@ invocation used by bootc. However, many properties used for container registry i
 can be configured via [containers-registries.conf](https://github.com/containers/image/blob/main/docs/containers-registries.conf.5.md)
 and apply to all commands operating on that image.
 
+It is not currently supported in general to launch "rootless" containers from system-owned
+image stores in general, whether from `/var/lib/containers` or the `/usr/lib/bootc/storage`.
+There is no integration between bootc and "rootless" storage today, and none is planned.
+Instead, it's recommended to ensure that your "system" or "rootful" containers drop
+privileges. More in e.g. <https://github.com/containers/podman/discussions/13728>.
+
 ### Distro/OS installer support
 
 At the current time, logically bound images are [not supported by Anaconda](https://github.com/rhinstaller/anaconda/discussions/5197).