Why always blue backlighting...
Because it's popular, easy on the eyes/not as distracting as more aggressive colors and is generally said to have a "calming", relaxing effect. Plus a lot of computer peripherals today come with blue LEDs, therefore a keyboard with blue backlighting is much more likely to go well with the rest of the peripherals than a keyboard with pink backlighting for example.
Tbh, I wish I didn't care for backlighting, it would make it so easy to go ahead and buy the DAS.
Before I bought my Zowie Celeritas I had a Razer Lycosa and thought backlighting was very important as well (but since there are hardly any mechanical keyboards with backlighting
and a German layout, I didn't have much of a choice... didn't want a Blackwidow after the keycap disaster of the Lycosa, so there wasn't much left). Ever since I use the Celeritas I didn't miss the backlighting option for one second. While I type I usually don't look at the keyboard and even if I do - well, the keyboard sits in front of my monitors and when they're on (and they usually are when I'm typing

) they emit more than enough light to see everything just fine. So it might not be as big of a deal as you think it is
