We (I am the author of that post) definitely care about color blind users and want to make our tools as usable for as many people as possible! Photoshop allows

We (I am the author of that post) definitely care about color blind users and want to make our tools as usable for as many people as possible! Photoshop allows you to simulate varieties of color blindness and we keep that in mind. We are also trying to provide better visual cues, like shapes/textures rather than relying solely on colors. The network panel in nightly for example has shapes to indicate HTTP response codes. Secondly, once you switch to the light theme (available in the options pane of nightly) it should persist for you, so it will become your "default".