I never have been a big fan of waffle charts:

  • I find it harder to read them then straightforward bar or column charts (in a similar way, pie charts are less readable)

  • They are a pain to maintain in PowerPoint/Keynote (counting boxes)

But, what people do to show the results of the US elections is clever. by adding the semi-saturated colours in, you get a nice sense of how things are developing:

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