It’s not just about precision, it’s about feedback. Being directly connected with the steering linkage gives valuable feedback about the road and the front wheels - just because handicapped people have an alternative that they may use out of necessity does not mean it’s a better solution.
In a fully autonomous car, sure perhaps a simple manual system as a backup makes sense but we aren’t there yet. You are talking absolute nonsense, and I can only assume you haven’t ever driven a vehicle.