One big advantage of FBW is that it enables the use of artificial stability with the computers, usually triplicated, working like mad things to give us a smooth progress.
Instead of the usual down load on the tail to produce natural stability in pitch the designer can now program the computers to provide a significant up load from the tail and at the same time reduce its size and weight. This also leads to lower weight for the wing's structure as they have less of a lifting task. Result - a big increase in efficiency. Stability in roll and yaw is simplified and smoothed.
Another big advantage is that the designer and the TPs are able to introduce automatic g limiting. stall inhibiting etc to prevent below average operators from coming to grief.
Artificial feel has to be an integral element of the system as humans all manually fly and drive by the feel of the controls. The F-16 fighter has a Side Stick Controller force per g of 3. The pilot is thus pulling 27 pounds with his right wrist to reach an automatic limit of +9g. Meanwhile the tail is waggling around smoothing out tiny accelerations and preventing a runaway pitch up with a fairly hefty Up load.
These are just a few basic features of FBW flight controls.
There is already some spin off of aviation's FBW into ground vehicles.