A compatibility tool analyzes both partners' traits to point out complementary strengths and potential friction. A highly structured person and a highly flexible one may clash on plans yet back each other up in crisis. Seeing difference is the first step to turning it from a problem into a resource.
XinYou's compatibility reading doesn't predict 'whether you'll make it'; it helps you understand 'how to get along smoother'. It is built on mature personality and relationship theory, not fatalism.
Research shows relationship satisfaction depends more on 'repair ability after conflict' than on 'absence of conflict'. So the point of compatibility is to equip understanding in advance, not to find a perfect match.
A good relationship isn't finding the right person; it's treating the person in front of you the right way. Compatibility just helps you get the manual.