Are hydraulics that different than mechanical gears (winches) and lines? Both move in or out based on human input (either through direct manual manipulation or programming)

Some human should make and execute the decision (to trim/ease or change direction). How that command is executed (electronic, manual, hydraulic) doesn't matter as much in my mind

And drone jets will follow just as soon as the public gets used to driverless cars (at which point Google will make trillions)

We don't seem to have a problem with roller coasters and other "driverless" entertainment, even when it's assembled and run by folks with IQ lower than my shoe size...