it is easy to design a software that do fancy things, coding in Unix is fun.
it is difficult to polish software so everyone can use it, creating apple like dummy user interface requires a lot of time.

the same logic applies here. air plane maybe more complicated (heck, i am in this business), but you get a team of people to serve the air plane and operator going though years of training, now if we need to build an air plane that can be delivered to every one, knowing most of them has no patient to read 2 minutes manual, will most likely ignore the maintenance (imaging performing a fully assembly/disassemble for every 300 fly hours), will be putting the plane to variously conditions and just expect it to work the moment they turn the key... there is a lot of work here.

 

While it's interesting to see some of this information put together like that, nothing in that article was particularly surprising. Just wait til you see how complex cars get once they become completely autonomous! It won't be long now...

Although the move to all-electric drivetrains will do something to mitigate a lot of that complexity. Also, thankfully, I suspect a great deal of that AI software will frequently be reusable from one model to the next.