"Solving a largely imaginary user goal"

Lea Verou proposes that dark-mode toggles should use a "smart" two-option interface (light and dark) rather than explicitly showing three options (light, dark, and system default), with the toggle intelligently handling the system preference in the background. This approach reduces cognitive load and avoids designing UI around implementation details rather than actual user goals, since the "system default" option is confusing and doesn't align with how users naturally think about the choice.