Why is dark mode treated as something new since around a year or so? Look at 70's terminals and 80's DOS computers. Notice how they are green on black, light g

Why is dark mode treated as something new since around a year or so? Look at 70's terminals and 80's DOS computers. Notice how they are green on black, light gray on black or amber on black: dark mode. Look at code editors from the 90s or early 2000s. They allowed choosing color schemes, many of which were light text on dark background. Look at websites from the 90s and mid 2000s: there was still some diversity in design back then, some allowed switching CSS color schemes by the user. Look at Windows 3.11, Windows 98, XP, etc...: allowed changing all the colors of everything (no clue how the situation in Windows 10 is). Android also has been having white text on black in various iterations of early to recent versions, especially for OLED screens. Etc...