"Corporate Personhood" allows the corporate entity to be a responsibility sink for the owners. They alternative is that people can sue the owners/officers directly for the "actions" of the corporation.
"We can direct the corporation we own to dump raw sewage into rivers but you can't hold us accountable personally for that decision" is an absolutely messed way to run things
Sure but you need to be able to get to “someone” when say the owner skips town or dies or… plus this firewall makes it so people will be more willing to build businesses.
Requiring one function does not require the other though.
"Corporate personhood" is a legal concept where how person-like a corporation is can be defined in whichever way is convenient to how we want the law to operate.