Anyway, it was just an offer, not a request or demand, and it wasn't for me at all. It was just a suggestion as a component, regardless of the fact that it exists in other themes, I don't think anyone will change their premium theme just for that advantage. That's why it would be wonderful to have such a component, separately.
Small ? It is not small it takes ages to create darkmode. You can use GreenByGreen theme as a example or White them that comes with premium version. Both have dark/lite mode.