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They seem to have advantage for color blind people, no? It's easier to disambiguate shapes than colors.

• calvins 10y ago
  It's easier to disambiguate shapes and colors than just shapes or just colors -- something like a checkmark of one color, and an X of a different color.
  • i386 10y ago
    FWIW We've got colored indicators that have appropriate iconography for these kinds of users.