> I really dislike this kind of visualization since it makes regions with total different population densities appear on the same level.
This visualization is using European NUTS-2 regions, which have roughly equal population. Each region is between 800k and 3 million people. While perfect scaling is not practically possible, it is much better than geographical regions.
Perfect scaling is easy: just represent dots on the maps instead of regions, which is way closer to actual raw data. Of course it requires more work, but that's what people are paid for when they collect data.
This visualization is using European NUTS-2 regions, which have roughly equal population. Each region is between 800k and 3 million people. While perfect scaling is not practically possible, it is much better than geographical regions.