The pilot still commands the aircraft
Fly-by-wire does not mean the computer chooses the destination or flies independently. The pilot provides control inputs while computers translate them into surface movements appropriate to the flight condition.
Control laws can change handling characteristics
Software can make a large aircraft respond consistently across speed and configuration changes. Some designs also include protections intended to reduce the chance of exceeding selected limits.
Electrical signals reduce mechanical complexity
Removing long runs of cables and linkages can save weight and simplify routing. The system then depends on reliable computers, sensors, power supplies and actuators.
Redundancy is essential
Multiple channels monitor one another so that a single computer or electrical failure does not normally remove control. Certification requires careful analysis of possible failure combinations.
Different manufacturers use different philosophies
Some systems give computers greater authority to enforce flight-envelope protections, while others preserve a more direct-feeling pilot command structure. “Fly-by-wire” therefore describes an architecture, not one universal behavior.
The technology enables more than cockpit simplification
Modern stability, autopilot and performance functions can integrate closely with electronic flight controls. That allows designers to optimize aircraft behavior in ways that would be difficult with purely mechanical systems.
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