I wasn't a big fan of the excessive blue LEDs that appeared everywhere after they were invented, either. Though it was understandable enthusiasm for something n

I wasn't a big fan of the excessive blue LEDs that appeared everywhere after they were invented, either. Though it was understandable enthusiasm for something new by product developers, after decades of having only red-green combinations. But blue LEDs are what make white LEDs work, and those have revolutionised ordinary lighting in a big way. The linked video goes into this at the end. Blue LEDs (or white LEDs, or blue OLEDs) are also used in modern, high quality computer and phone displays.