The images have global color option and this would be excellent feature also for the texts added via the product builder. 

For example, I make premade layouts for business card. Every design has about 5 text fields. If I want to change the color options to the texts, it will mean I have to modify individually about 200 text fields.

With global font color option, I don't have to go through every product and every text field to add the new color.