For now, the answer depends on how the self-update mechanism works. Some snaps may choose to self-update some components using a directory like $SNAP_DATA and so it makes sense to continue the self-update like that, but for others it probably makes more sense to just turn it off entirely.
Eventually, we will have hooks that applications can tie into such that an app can:
- detect if there is an update available
- attempt to install the update
See the options discussed here: [WIP] Refresh App Awareness