> You have far less agency than you think you do

I guess it's possible, but you have no idea how much agency I think I have.

To focus on one example you give, "Society itself is a removed of agency. Animals can do whatever they want, humans are constrained socially in what we're allowed to do." -- this is a clear misunderstanding of what agency is, or at least how I am using it. You CAN do anything you are physically capable of doing, even in violation of society's rules. Complete agency! People desire things that are only obtainable through conformance with society's rules, or, more sociopathically, only obtainable through the appearance of conformance with society's rules. That society survives is in effect dependent on this fragile web of incentives and expectations and social consequences and martial consequences

You can choose not to drink Coke! That people statistically choose to drink Coke does not mean that people lack agency. If you think the reason people drink Coke is because TV tells you to, then I encourage you to create your own beverage and advertise the shit out it and then get super rich!

The problem is that there is a feeling that you have written out here: that manipulation of people's desires is somehow mechanistic or predictable.

That you can follow some script and get people to do something. But it only appears that way because you are looking at the survivors of the vicious evolution, red in tooth and branding. All the ads in the world didn't make Crystal Pepsi a winner (or frankly make Pepsi a winner). The combination of factors that makes one thing successful and another not cannot be easily replicated or copied from one domain to another or even within one domain.

If there were a mechanism then someone would be using it; everyone would be using it; and there would be no winners and everyone would be a winner. It's a self-contradictory view that doesn't match reality in any way.