I find the article extremely dishonest as it goes from using a "yellow to blue gradient" (let's call that the initial requirement) and turns it into a supposedly better "yellow to orange to red to pink to purple to blue" gradient.
I think anybody that has to choose between the "gray dead zone" and the "rainbow" will ALWAYS settle for the "gray dead zone" if the initial requirement is to make a "yellow to blue gradient".
Does it contain valuable information? Yes. Does it avoid the "gray dead zone" problem? Not at all, unless you claim that bringing another problem magnitudes larger is "avoiding the problem".
It's also dishonest in the sense that gradients from bright yellow to bright blue or other combos that produce a grey deadzone are probably pretty hard to find in the wild.
I've tried the gradient generator, and I found it actually a bit difficult to pick colors that produced a significant grey zone.
I think anybody that has to choose between the "gray dead zone" and the "rainbow" will ALWAYS settle for the "gray dead zone" if the initial requirement is to make a "yellow to blue gradient".
Does it contain valuable information? Yes. Does it avoid the "gray dead zone" problem? Not at all, unless you claim that bringing another problem magnitudes larger is "avoiding the problem".