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 was trying to show that it is not "merely a legal expedient", that corporate personhood had a specific purpose, and that it differed from a real person. I think that the confusion about legal personhood in corporations comes from how lawyers explain its existence. A couple of lawyers I've had explained it as, it's just like a person in the law, except where it's different.
The problem is that we haven't created a clear enough distinction between a natural person and a legal person. In many cases, corporations have rights but not the responsibility. For example, they have speech rights, but they don't go to jail when the corporation commits a crime. The judicial inequalities between ordinary people and rich people are even greater between natural persons and corporations.
Are AIs?