Is there a case anyone can think of (other than backward compatibility with legacy workflows and expectations) that one would write a new browser app with an old desktop OS look and feel?

That is, are there use cases that a classic OS's GUI excels at more than the typical web or mobile/tablet app GUI, that we have lost due to the typical style and behavior of the latter types of apps? I mean both the interaction model of the windows and menus themselves, and also the look and behavior of elements used to render content.