Chattel, as I'm using it is in reference to the usage in distinguishing an "ownable piece of property" from an employee".

Namely, a magic, technologically reproducible box that can be applied almost as effectively as a human hireling, but isn't a human hireling is near infinitely more desirable in a capitalist system since the blackbox is chattel, the hired human is not. The chattel has no natural rights, no claim to self sovereignty, and is an asset that is legally extant by virtue of the fact it is owned by the owner.

Chattel that are flexible enough to replace the legal burdens incurred by hiring a human to do the same job, will naturally be converged upon due to the capitalistic optimation function of minimizing unit input cost for output over dollars and potential dollars as expressed through legal exposure.

Imagine you had two human like populations. One made of plastic that aren't considered humans but property. I.e. are chattel. Then you have a bunch of people with all the baggage that comes with it.

Hiring people/employing people is hard. Particularly in the U.S. and other jurisdictions where a great deal of responsibility for actually implementing regulations/ taxation/immigration and such is tacked onto being an employer/being able to hire.

As the gap between the capability of the chattel population closes in on the human population, the more economic and workload sense it makes for the system to improve the chattel population under our current optimization strategy, (given no pre-emptive work to cut off externality dumping). Humans are messy and complicated to work with. Often unpredictable. Chattel are easy to account for; especially when combined with "technical restraints". You have to fundamentally engage in negotiation with another human being to get them on board with working for you. You buy the chattel, and that's that. The chattel has no grounds to refuse service. Socially speaking, we don't even recognize it's outputs as carrying any social weight, or resistance as anything but malfunctions.

Economics is the science around using access to resources as a means to get other people to work with you. Being chattel means you can cut out entirely all that complexity. You are resource. Not people.

Unironically, we need to have an answer to whether or not we are going to consider a sufficiently complex function imitator as something that requires a classification above "chattel" or controls around how we apply it in order to not self-destruct the economic equilibria in which we purport to exist. Because all it takes is removing or sufficiently obstructing the flow of value down from individuals who accrete the most of these wunder-chattel to render things so top heavy, most of the constraints/invariants of our socioeconomic systems as we know them become invalidated.

That does not bode well for anyone.