Basing one's opinion on how a static screenshot looks, is the reason we've moved towards pretty looks and away from usability concerns.

As other commentors have said, the overriding concern with these older OSs was to make them as easy as possible to use. It would never have crossed these developers' minds to, for example, hide the scrollbar because they think it looks ugly.

Looking at a screenshot doesn't really tell you anything if you're not familiar with it, but it's a nice reminder of using that software for those who are.

In most of the comments here, I'm not seeing "nostalgia" or "the love for youth". I'm seeing frustration with how the carefully researched and developed principles have been forgotten.