I definitely feel that during the day but have the inverse experience when the sun has set (light mode feels unbearable after dark).

I like my code editor to respect my OS which automatically changes from light to dark mode when the sun sets.

Even with flux? Shifting the white point is far more comfortable than dark mode for me. In fact it also matches with the ambient lighting, 4000-6000k during the daytime then 2000-2700k after sunset.