Both Marcin and Lea are ignoring users who have automatic sunset-to-sunrise dark theme switching.
This is not a novelty but a built-in feature called “Auto” Appearance in MacOS, iOS, iPadOS. Similar feature exists in Android and KDE.
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.
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