Yeah a big reason you see so much pushback on clanker slop is that it's having (and there was certainly the expectation of it having) a negative impact on the ability of plenty of people to pay their bills.
I used to think that until I did a little digging into it. Specifically, corporations are considered legal persons because they are separate legal entities, thereby creating a wall between your personal affairs and your business. It protects your personal assets from any liabilities, debts, or lawsuits.
Also, since it's a separate entity, its lifetime is not tied to the owner. So if the owner dies, their shares are inherited by somebody else, and the company keeps operating.
It helps in raising money for business operations. A corporation raises capital by issuing and selling shares of stock. However, if a physical person did that, I think it would be called indentured servitude.
I'm confused about why you believe this contrasts with what the above poster said. You've described a bunch of practical reasons why this is legally expedient and also at least one that seems to contrast with your own concept of personhood
A corporation is a separate entity. They hire people to work for them, but any liabilities incurred by the Corporation are rarely passed through to the workers. If you pay attention, it's more likely for a worker to go to jail or be held responsible for a screw-up by the legal system than one of the suits at the top.