Overview
The transition from constant supervision to scoped asynchronous execution changes the productivity model. The human no longer has to remain present for every command. While one agent explores a bug, another can implement a feature, and another can review a pull request.
This is a practical form of parallelization. It does not create additional strategic decision-makers. It creates additional execution workers whose output returns to the human or team for integration and judgment.
Sandboxing makes that parallelism more responsible. It separates the question "Can the agent execute freely inside this task environment?" from the question "Should the agent have unrestricted access to the operator's full system?" The first may be useful; the second is unnecessary for most delegated work.