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AFAIK, Gravitational waves are out first method of "seeing" the universe that isn't just capturing incoming photons from the object under observation. The only exception is neutrino detectors, which have hilariously bad resolution.

It seems reasonable to expect new phenomena to be uncovered this way.

This seems like a good example of that.

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These methods also allow to observe the same event in different ways. This is known as "multi-messenger astronomy":

https://en.wikipedia.org/wiki/Multi-messenger_astronomy

Also neutrino detectors and gravitational wave detectors allow to observe the very early universe. Until something like 300K years after the Big Bang the universe was too hot for atoms to form and so it was full of particles that block light. But the universe became clear for neutrinos a lot earlier and for gravitational waves even earlier (think it's milliseconds past the Big Bang).

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