Who's the debate with? Never heard the debate. OR the flashing MC lights.
Just sayin...
I've never seen a motorcycle come from the factory with modulated lights, but I've also never owned every bike made. There are products available in the aftermarket which modulate either the head, tail or brakelights to make motorcycles more visible to other motorists. Headlight flashers typically use a timed relay circuit to automatically cycle between low and high beams for a given time period with respect to each mode. Brakelight flashers come in many varieties. Some flash a number of times and go solid, others flash repeatedly as long as the brake lever/pedal are applied. The latter I have seen other riders get ticketed for.