> It is not the gears, motors and copper wire that are bottlenecking robots.

It is those things that are bottlenecking the price of robots.

The price of something tends towards the marginal cost, and the marginal cost of software is close to $0. Robots cost a lot more than that (what's the price of this robot?).

Edit: In fact Figure 03 imply marginal costs matter:

  Mass manufacturing: Figure 03 was engineered from the ground-up for high-volume manufacturing