... or someone missed the last sentence in the pasted quote.
F-Spot is terrible. Gimp is super powerful but I've seen professional graphics designers get the quaking shivers when talking about their attempts to use it.
Evolution is terrible. Thunderbird is decent but, even so, no regular human will get Exchange-style calendaring to work.
Web design tools? Really? Amaya I suppose, but it's terrible when compared to DreamWeaver. What else did you have in mind? (a text editor, while I use one for web development every day, is not a web development tool)
FreeCAD is not even useful for CAD yet much less competing with AutoCad or SolidWorks.
I love and use free software every day but I do recognize that there are places where it falls very short when compared to proprietary stuff. And that's the long tail that keeps a lot of people pinned to proprietary systems.