It’s in TFA, just a few sentences in.
Isn’t the article about how to best deal with the UI for letting the user indicate that the system should decide? Which covers your case.
Thanks, I missed that!
But still, the article continues to ignore that setting, doesn’t it?
The light/dark theme toggle is for a small fraction of the people who genuinely care about controlling the theme to be "right for them" and not just whatever.