Ok so in defense of their voronoi graphs, if they used a segmented bar or pie chart instead, you wouldn't be able to see the small quantities clearly, and if they used circles of different sizes, it would be easy to mistake the radii as the measured quantity instead of the area. Similar issue arises with lengths/widths if you use rectangles. Their visualization nudges you to compare areas which is a good feature imo.
> and if they used circles of different sizes, it would be easy to mistake the radii as the measured quantity instead of the area
No, if the measured quantity is represented as the radius, everyone will assume it's the area, and you've designed a very bad graph. If the measured quantity is represented as the area, everyone will assume it's the area, and you're fine. The area is what you can see.
