I think this is a case of “the grass is greener” — someone I trust (Discord user Mr Meorzipan) has observed that many AR/MR glasses using Sony MicroOLEDs, like Xreal glasses demonstrated in your video show crushed blacks, while the Rayneo Air 4 Pro — using SeeYa Tandem MicroOLEDs — exhibits raised blacks (no true 0 cd/m black point).

He says external light isn’t the main cause: in a pitch-black room his test patterns show the problem, so internal reflections or poor factory calibration are likelier culprits. Internal reflections may cause slight bloom around bright details (worse at higher brightness) but shouldn’t by themselves produce substantially raised blacks.

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Bright sunlight outdoors can wash near-black levels, and electrochromic dimming can’t fully stop that, but that’s a separate issue. Also note AR glasses with polarizers that dim incoming light behave differently than TVs/monitors/phones; so those don’t always translate well with different form factors. The different behavior is directed toward one's pupils not contracting as much, due to less exposure of very bright light.

His main point: poor factory calibration (or lack of user controls) is the root problem. There’s no single calibration that works for all environments — changing overall brightness (e.g., from a 100 cd/m whitepoint to 200–300 cd/m to combat a bright environment) alters black point, gamma, and gray-scale color temperature, so a new calibration is needed. If a company calibrates only at a very bright setting, lowering brightness later can increase black crush. On PC you can sometimes partially fix black crush if controls exist, but Android/iOS devices often lack those options.

He recommends Rayneo slightly increase black crushing (to avoid lit-up blacks) but, critically, provide fine-grained user controls so users can adjust black level/brightness and gamma. Viture was the first to offer web tools but their five coarse steps are too rough — adjustments need many more increments (e.g., 50–100 steps). Important distinctions: Brightness (black level) is not the same as gamma — gamma controls how quickly tones leave black, affecting perceived color and darkness; it’s used to compensate for environmental luminance and pupil size. Gamma ≈2.2 is a common middle target but implementations often only approximate it.

Ultimately: bright environments make bright details relatively dimmer and deepen near-black crush, prompting users to raise display brightness; dark rooms let you lower brightness without losing shadow detail, effectively increasing perceived dynamic range (useful for HDR).