I think copyright law should be different for originators vs. owning individuals vs. legal entities. Once the legal rights of a work are separated from the originator, the work should pass to the public domain faster.
If a company or different individual hires someone to create work for them, the work would transfer from the originator to the company or individual, thus putting it on the faster track automatically.
Originator sells online to customer and transfers copyright: shorter protection applies, since the originator no longer owns it.
Originator transfers work to LLC: shorter protection applies. You gain LLC benefits for a shorter copyright term.
If you assign work to a different entity, it is no longer owned by the originator, and subject to a shorter copyright term.
Employees create content all the time that is copyrighted by default by their employer and never by the employee.