the goal of this particular section were to maximize what authors and inventors can extract from their creations then explicitly assigning to them the property rights in perpetuity of said creations would have been the way to ensure that outcome.

Actually it’s the opposite - both patents and copyrights expire after a period of time, which is the compromise we’ve reached between incentivising people to make money for themselves personally (giving them a legally protected right over their creations), and allowing wider society to benefit from inventions and scientific discovery. The fact that patents and copyrights do not exist in perpetuity points towards the idea that they exist to promote invention and scientific discovery in ways that can be commercially exploited but only for a limited time, usually by their creator or inventor (or his heirs under certain circumstances).

Not sure what else to tell you. This really isn’t that complicated or controversial, in the US at least.