It depends on execution, but I could see transparent screens being nice for a desk setup where privacy isn’t a concern. They could make for a cleaner, more open

It depends on execution, but I could see transparent screens being nice for a desk setup where privacy isn’t a concern. They could make for a cleaner, more open, less cluttered feel than could be had with traditional displays. One could also more easily have arbitrary logical divisions of transparent screens. For instance one could set up a single transparent superultrawide screen to function as three separate displays if they wanted (useful for having multiple sets of virtual desktops) with transparency being used to create aesthetically pleasing divisions between each virtual screen (imagine each screen as a roundrect).