And that was a great user experience:

Note the scrollbars that indicate where you are in your document/file list. No guessing on how many pages (if any!) there are to go.

Note the edges of the windows that can be clicked on with a mouse with confidence. I don't need to be a 16 year old pro E-sports gamer to hit that 1 pixel edge as in current desktop environments.

Note the clear button UI. You know 1: what part of the UI is a button and 2: if a button is active.

Note the cohesive windows and colors. No mess of different UI toolkits, each with their own buttons, menubar layout and color space.

But then I am not the target audience anymore: The desktop power user is a dying breed. 95% ( * ) of the people in the world view "the internet" via a small screen on their phone and have no interest in running multiple programs at once, managing large amounts of data on file systems, or even running their own PC.

(*) random statistic that I made up.