When an Installed Package is installed via GS, permission sets with View/Edit All Data system permission don't automatically get updated for the new objects in the package like they do during a manual install. We then have to update the PS via deployment or manually or future deployments will fail with "Read All permission is required for [sObject]". I would think it would be fairly safe to allow GS to automatically add the appropriate object permissions to the perm set in the target org since Salesforce requires that all objects have, at minimum, the same level of access as the permission set or profile level access.