That's more of an argument for reflective/transflective screens. Trying to overcome both sunlight and reflections with a transmissive screen doesn't work very well, and only exacerbates the eye-health problem. Not great for battery life either. That's a lot of problems to be solved before there's even a chance that people would use their computers more outdoors, and even then the odds are slim. Maybe people should get outside away from their screens.