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.

	▲	warpech an hour ago \| parent [-]
		Thanks, I missed that! But then I don't understand why a seasoned designer purposely suggests that ignoring it might be good for the user, especially since light/dark theme toggle is for a small fraction of the people who genuinely care about the theme being "right for them" and not just whatever.