If you place any kind of sign, and start typing, you see that the text's main color is white. I dont know the devs wanted this, but I explored that.
MC-137569
Signs main text color is white
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The way I see it, the signs should all have text colors matching that of the item texture. Additionally, I would like to see the option to either recolor sign colors within the GUI, or have some kind of file in a resource pack to determine the sign text colors per sign-type.