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To be fair, the full book, "Refactoring UI" — from which this article sourced — has a section on color accessibility. To quote from there:

> "Always use color to support something that your design is already saying; never use it as the only means of communication."

That seems pretty out of the scope of this article. An article about accessibility can be covered separately and most accessibility articles already recommend that color isn't the only indicator, so a warning/error is still distinguishable with icons & shapes & text.

It's kind of discouraging to see insinuations that the author doesn't consider certain people because an article doesn't explore and include caveats for everything.

I am part of colorblind groups. People loves mixing green and red in scientific plots in papers I read. It's effing irritating. 10% is not such a small number, we are many more than IE users.

Thank you!

Colorblind friendly red/yellow/green for status for danger/warning/success goes a long way. And it's not that hard.