A lot of the power of Contextual Flow Control comes from simply not allowing network access.

It's kind of wild that many sandboxes allow network access by default!

Moving data across a network to an arbitrary host allows the data to flow from one set of laws of physics to another, completely unknown one.

Code with network access might fling the data that it can see to anywhere.

But the value of Contextual Flow Control is much greater than just neutering network (lots of runtimes do that).

The value of Contextual Flow Control is the ability to reduce code to more granular chunks, whose data flows can be analyzed more precisely.

Less code has access to privileged resources.

This granularity allows a much higher ceiling on the value of combining existing modules into novel combinations, safely.

Allowing more code reuse in novel situations.