On “light”-related aspects:
“Tones and colors do NOT always record exactly what the camera saw.”
Often the brightness, contrast, and color balance in a photograph will more accurately depict “what the camera saw” if those aspects undergo some post-exposure changes* (so TCQ allows those changes).
Don’t worry: most devices record “light”-related aspects well enough most of the time for the result to qualify as TCQ without further changes!
*In some cases — for example when a scene is recorded on negative film — the tones and colors may have to be radically changed to depict “what the camera saw.”