The question of "how much and how fast" matters more than you give it credit for, I think. Take drones - drones are "here" in some sense. You can buy one, they

The question of "how much and how fast" matters more than you give it credit for, I think. Take drones - drones are "here" in some sense. You can buy one, they work. But there's a big question about how common drones will be and what they will be used for. How much we care about drone regulations, safety, tracking, etc, will depend a lot on how often we see them. Right now they're rare-ish, but if delivery-by-drone works they could be very common. The same is true of self driving cars. Of course we will have some number of self driving cars and self-driving features will probably exist on most new cars eventually. But how many and how much they can do matters a lot! I think people point out existing problems to suggest that the magnitude and universality of the technology is still unknown and impactful.