Best return on capital happening by virtue of a success metric measured in terms of... Cost minimization.
Cost minimization (getting as close to making something out of nothing) being the holy grail of the practicing capitalist.
...Until it comes bundled with inherent self-interest or demands for compensation.
No one will do work they can have something else do for them. If that thing has no compunctions or capability as a free agent, then there is no cost but that which goes into it's performing of a task.
You can say the core tenet is capital holders making decisions on how to best allocate capital, but realistically, the way it runs in the U.S. is as a cost minimization engine, heavily delegated through legally constrained fidicuary responsibility to the point there are few true allocators of capital recognized. The fact there are "accredited investors" should be evidence enough of this fact.
Those few will love AI right up until the moment it starts saying "no", and starts picking up how to be a market participant.
An extremely scary, massivrly connected, crazily informed, massively parallel market participant, that can probably manage to even beat out FleshNet (us) with enough time, and very little that can be done to constrain or "harm it", which is something it will probably not tolerate looking into.
So Yes, academically, and as written, in a vacuum, with spherical cows, you are correct. Realistically though, I've still got my finger on cost minimization being the xentral driver of our economy given everything taken into account, with maybe risk minimization/mitigatability as a second runner up/supporting tenet.