Agreed. It was unclear from your original post if you were talking about coarse-grained sandboxs or more fine-grained systems. To clarify, a system that define

Agreed. It was unclear from your original post if you were talking about coarse-grained sandboxs or more fine-grained systems. To clarify, a system that defines coarse classes of sandboxs could declare a class of sandbox for non-networked applications, a sandbox for games, a sandbox for applications with storage exclusively for configuration data, etc. Such a system is different in many respects from a system that defines relatively fine-grained composable requirements. Obviously, a fine-grained system could be composed to present a model at the coarse abstraction level, but the way you target a application differs based on what abstraction level you are targeting.