I can't help but read this as a severely pessimistic take on the capabilities of markets, since we can trace trying to "optimize productivity" back to essentially the earliest things even remotely resembling the modern economy and most of the enormous amount of research, money, and effort that has been poured into this endeavor has been at best occasionally better than chance at consistently improving any kind of "productivity" in the long term through labor practices, unless we directly define the suffering of workers as "productivity."
Most meaningful gains in productive capacity come from either resource windfalls or technological progress, and general theories of how to reproducibly increase worker productivity via policy are more akin to sacred rituals than settled science.
To be clear, I personally do think that markets function as optimizers, though as with any optimizer this tends to function in a very narrow scope. Most extant companies, for example, are driven by capital markets, not consumer ones, which means that ROI for shareholders - even when that's driven by essentially marketing stocks or goosing metrics - is the main thing being optimized. Hypothetically, markets could optimize for organizational productivity in some other sense, but I think it's even pretty unclear whether there's a way to subdivide that usefully into any kind of apples-to-apples comparison of individual workers within organizations.