Of course they'll start by automating the simplest thing, because it's simplest to achieve. As the technology progresses, more complex things will be automated.
The video's claims aside, the point of automating this (or any) task is not to make it faster or better. The point is to replace humans.
The robot may be ponderous (for now), but it never calls in sick, never argues with the boss, never earns overtime, never takes a smoke break or a bathroom break, never fails a drug test, and will never join a union or claim workers comp or file an EEOC complaint. No need to pay benefits to the robot (or juggle schedules to avoid it), and no need to pay unemployment if you get rid of it.
Humans are messy and unreliable, and they cut into profits. Cut loose that rabble, and you don't have to pretend you care about them to keep them working anymore. Pay no attention to their squawking about loyalty and professionalism; the robot is way more loyal to you, and if you have to invest money in it, at least you own it.