I don't think that's the flipside to my point. I think the flipside to your point would be "why have IP protection at all? It's an idea in my head now, why should someone else have control over that and my ability to execute it?"

And I don't actually program anymore, so let's go with writing: should anyone have the ability to republish it without my consent after the copyright has ended? Yes. Even a big publisher.

Should anyone have the ability to take my created work and extend on it, using my creations outside of the created work? Yes, after the trademark ends.