It's strange — the PWM is 3840 Hz (according to the official website), so it should be great for the eyes. Also, it's not LTPO, it's LTPS, which is again a benefit for sensitive eyes.
On paper, the Oppo Find X9 offers almost zero compromises compared to the Pro model and still manages to be a slightly more compact phone. The price difference is also significant. But are the differences in both the cameras and battery really that small?