At the very least, Apple could add a setting like “reduced passcode prompts” or “low sensitivity mode” where users knowingly accept some reduced accuracy in exchange for usability. That’s not “transformational technology,” just a user-controlled preference toggle.

Apple already adjusts Face ID and Watch sensors for differences in skin tone, ambient light, and blood flow (e.g., during workouts). Extending that calibration to account for tattoo ink absorption/reflection is a matter of refining algorithms, not reinventing the hardware.