Comment by marcus_holmes

I don't think it's that no-one cares. We're a large enough segment of the population that they do, kinda, care.

It's that they don't understand. I've had designers ask me if I can tell two colours apart, and then say "ok, cool, so we can use those colours because we tested them on a colourblind person" without getting the point that I still won't notice the difference. They don't understand that colour just isn't a strong signal to me.

For someone with strong colour vision, which designers tend to have, colour is a huge signal. It's immediately obvious and carries meaning to them. In the range of design tools available to them, colour is high on the list. Being told they can't use it because 1/12 of us won't notice is hard for them to understand and feels arbitrary. I get it.