Dark mode is fine on CRTs. They have excellent contrast; they are like OLED displays in that regard where the unlighted regions are truly not lit. CRTs have a

Dark mode is fine on CRTs. They have excellent contrast; they are like OLED displays in that regard where the unlighted regions are truly not lit. CRTs have a harder time with black on white. The Mac's choice of black on white was unusual for the time, it was usually only seen on high end systems like workstations, with really good monitors with high refresh rates. (White on black was standard with computer displays thru the 70s into the 90s -- think of serial terminals and DOS PCs.)