Rainbow=6 colors

[Xx{Midday}xX]

10 years ago, the visible portion of the electromagnetic spectrum was modified so that the color indigo was omitted. Therefore, there are now only 6 major labeled colors in the visible spectrum. Also, the simplistic color wheel found in so many art classes defining primary and secondary colors does not have an indigo either, hence, 6 colors. If the visible spectrum has only 6 colors, then rainbows also only have 6 colors. Many people still define a rainbow as having 7 colors. Even some modern dictionaries provide illustrations of rainbows with 7 colors. This misunderstanding could be seen in the song, Nanairopanda (Seven Colored/Rainbow Panda), too. My question is, what was the necessity to change the visible spectrum, considering the difficulty in assimilating to the new standards? Isn't it of higher priority to ban the U.S. English measurement system change to metric standards?

As an aside: If Nanairopanda were to be renamed so it meant the official rainbow, it would be called Rokuiropanda (Six Colored/Rainbow Panda)...
I personally like Nanairopanda better, as a name.

Inspirational origin: physics SAT