If Black had 90 points and White had 90 points, and there was one dame from a seki, the score difference is 0 which is even?
You could say, “well that almost never happens”, but that’s also a bit of an arbitrary decision. Maybe you can base it on pro games, but it’s still a bit arbitrary.
What if there’s some board size, even or odd, or rectangular where the komi is exactly zero. What if it’s actually toroidal go? Or if it’s Go on a hexagonal/honeycomb board? Or maybe Thue-Morse Go (Thue-Morse (Fair Sharing) Sequence: A possible alternative to komi?)? I don’t expect all of the current pros to swap to that game because it’s in theory more perfect/fair etc. This feels like the current idea to swap to 7.0 komi.
One could say that maybe drawing with someone 10 times means you’re equally matched, but are you any less equally matched if you win 5 and lose 5?