From description to control
Treated as jargon, the Greeks describe a position. Treated as a control system, they are the setpoints an automated book is regulated against: hold portfolio delta near zero, cap gamma so a large move cannot force liquidation, size vega to a loss the account survives.
Why this is the automatable part
Rebalancing a book toward target exposures is arithmetic and continuous — precisely the work humans do badly and machines do well. A book that is delta-hedged on a rule will be hedged on the day a human would have been watching the news instead.
The cost of the control loop
Every rebalance pays a spread. Hedge too often and transaction costs consume the premium collected; too rarely and the book carries directional risk it was not paid to take. That frequency is a tuned parameter, and it is where most of the engineering effort in an options book actually goes.