If we lived without copyright the world would be different because of it. Insisting that a world without copyright look exactly like our own is dishonest
I don't think anyone is arguing that the world wouldn't be different.
The original author is arguing that the world would be better, but I don't think he successfully argues that. (And I personally do believe a no-copyright-at-all world would be worse than what we have now.)
If we lived without copyright the world would be different because of it. Insisting that a world without copyright look exactly like our own is dishonest