A servo is simpler than a full car lock. It has fewer and less complex moving parts. If the car already has a computer, controlling the door with it is cheaper than a dedicated mechanical locking. The difference is slim but you know how bean counters are.
A few bucks off the manufacture price is apparently cheaper than any lawsuits they anticipate.
No way is a computer controlled locking system cheaper to manufacture than a mechanical one... Is it??
A servo is simpler than a full car lock. It has fewer and less complex moving parts. If the car already has a computer, controlling the door with it is cheaper than a dedicated mechanical locking. The difference is slim but you know how bean counters are.