In HCI, I think the general (and researched) consensus about pie charts is that they are fine and probably perform better than alternatives when they have a few

In HCI, I think the general (and researched) consensus about pie charts is that they are fine and probably perform better than alternatives when they have a few (as in probably 4 or less) slices, but then go to total crap for anything much more. I think one of the best essays on this is from Stephen Few, but there's a fair amount of research on the Wikipedia page too. https://www.perceptualedge.com/articles/08-21-07.pdf https://www.perceptualedge.com/articles/08-21-07.pdf