One reason of why I would add the colour banana yellow is because in the crayola crayon box, there aren't that many yellow shades. In the crayola crayon box, the only yellow shades are yellow, yellow orange, and yellow green. These yellow shades don't even look all that yellow.
Another reason would be because with banana yellow, you could draw bananas, minions, and other bright and yellow things. Imagine what you could do with that yellow. You can create bright art which you can show to everyone.
So, adding the colour banana yellow would be the perfect colour to add