I used to work in the supply chain industry, and this kind of thing has existed in warehouses for decades under the name "engineered labor standards". The armband aspect is just the latest incarnation of it.

One of our customers had come up with an interesting incentive program: you were given "eight hours" of work and could go home whenever it was done. Many of the time-saving tricks that the employees came up with would have been frowned on by OSHA.