Seems simple enough, but if you think about how we experience flavor, you can see why this whole binary system the FDA has cooked up is not necessarily all that useful.
Well, the amplitude of the gravitational wave background that we detected is really at the upper limit of what we can model as coming from supermassive black hole binary system.
Although the numbers are a little bit uncertain, something like a third to a half of all stars in the sky are part of a binary or multiple star system.