Would be good to check colours (if you're someone who picks colours) against the new APCA algorithm (Advanced Perception of Colour), which will supersede the existing x:y one in the upcoming WCAG 3.0 (which may take a few years yet). APCA takes font size, weight, foreground/background, and even apparently ambient light/surroundings and intended purpose into consideration. It would be neat if terminal emulators could use the device's light sensor to optimize the contrast based on environmental factors.