I don't understand this "flat" design trend. Sure, complex 3D designs and skeuomorphism are too distracting. But why do we only use a few loud colors, which gi

I don't understand this "flat" design trend. Sure, complex 3D designs and skeuomorphism are too distracting. But why do we only use a few loud colors, which give me eye-cancer, if we have 16.78 million? Is it 2000 again? Are the flashing .gif coming back? I really prefer "almost flat" UI, like Google's websites or slightly-3D like Bootstrap 2.