It confirms what pretty much everyone already assumed would happen, but it's one of those things that should be tested just in case. Plenty of times tests have been performed and unexpected results appeared, leading to advancements in science. So if (on the very off chance) it didn't interact with gravity as expected, that might have led to improvements in our understanding of general relativity and/or quantum mechanics, since gravity is one of the big problems we have in trying to marry the two theories