The behavior you're describing is the behavior of a browser. The parent post was talking about maintaining the desktop metaphor; my actual desk has one drawer with pens and sticky notes in it. I can't open another drawer that also has the exact same pens and sticky notes in it.

I'm not necessarily siding with the parent post, but I think the point was fairly clear.

Now I've seen the video below, I understand the point. It's been a long, long time since I used earlier versions of MacOS and I was never a regular Mac user back then. I'm not sure if that was a better or less convenient method of browsing files. I can see the benefits of both Finders to be honest.