Huh? Why wouldn’t you want to maximize compatibility considering how expensive divorces can be, both financially and mentally?

Humans, no matter how unique and self-important they might be, can certainly be broken down into personality traits to come up with a model that projects the likelihood of a lasting marriage. It likely won’t be perfect or precise, but it can be done, so I’m not sure what your point even is. As people age, it’s just the fleeting expressions of themselves that whither away, but they have a core personality founded on their values and goals, which stand the test of time. That’s not the sort of thing that you can just mix with someone else who has a different set of values and goals.