Personally, I think dark mode is unnecessary feature creep. But it's also because I never use it and hate it when it's the default and I have to go hunt for the hidden button to switch it off: I need lots of light, otherwise letters get blurry for me, so I'm just another biased human being =)
I'd also add for the defense of white themes that with OLED panels showing up everywhere (where dark pixels are effectively shut off), that a dark BG with light FG/text has quite a bit of a "halo" effect on the letters and this fuzziness wreaks havock on my eyesight/fatigue.
