Sleep to long between the moment you push on pedal and when engine began to react. Toyota Camry 2002 and Volvo S80 bright examples of not very finished constructions. I am very upset and dissapointent that Mazda6 went this way.
Drive-by-wire refers to the electric wires. The technology is from the flight industry where Fly-by-wire have been around since the 80's.
Though Mazda6 hasn't got drive-by-wire in it's real meaning. The only car I know if that is totalty -by-wirecontrolled is a concept car from Swedish ball bearing manufacuter SKF (I guess they make more then ball bearings nowadays as they managed to do a whole car). It's really neat. With that technology you no longer need to make different torpedo walls for leftside/wrongside controlled cars, no body damaging steering colums.
The car was really neat. It had a cool steering wheel with a display and a lot of gizmos
One of the advantages to "drive by wire" is that ECU tuning can be used to make the engine respond quicker not slower as there is no physical cable to move.
However, drive by wire can also be "tuned" so that the driver thinks the car is quicker as the throttle curve can be adjusted to be more aggressive, meaning, it can be tuned so that a small increase in pedal pressure results in a larger movement in the servo opening the throttle. But, it does have greater advantages when it comes to tuning.
The negative is that the programming in the ECU is more complex as the tuner must take all the systems into account not just air/fuel mixture. But the system is then better all around.