The default tab10 qualitative colormap is not color blind friendly, at least with my form of color blindness; I have difficulty telling the second and third colors apart. It would be nice to have a new default qualitative colormap that is color blind friendly, since it's the most commonly used. As Matplotlib 2 is finding increased adoption, I'm often coming across plots that I have difficulty reading due to the default colormap.

I find the perceptually uniform sequential colormaps quite nice, since I can actually read them. It's unfortunate that the same isn't true of the qualitative colormaps. The new Tableau 10 colormap is much better in this regard, but I'm guessing that there are intellectual property concerns that would bar including it.