Useful for a truly never-connected 'island' (meaning it never needs to speak to the outside world). However, even some of the use cases they cite rarely exist

Useful for a truly never-connected 'island' (meaning it never needs to speak to the outside world). However, even some of the use cases they cite rarely exist on a never-connected island, e.g. industrial automation and transportation. So, to be broadly applicable, it needs to be secure by design for connected use cases as well, even if those connections are considered to be ephemeral (e.g. remote management, periodic telemetry, metadata sharing, etc.).