alt Hacker NewsIncusOS is another - read-only root FS, interactions with the system exclusively through the Incus API, no package manager, blue-green OS updates (à la Steam Deck / Home Assistant OS).
Talos on IncusOS is likely a very interesting stack that I intend to play with hopefully in the near future.
> blue-green OS updates
First time I heard someone call it blue-green OS updates instead of A/B OS updates.