I had no idea that dark themes were hard to read for people. I have "color blindness" and for me it is a panacea, I should have known it must be anathema to another cohort.
I have partial color blindness and glaucoma which I think aren't related to my inability to read dark themes. When I try to read white or light text on a dark background, something in my eyes start flashing and I develop a headache in less than 60 seconds, it's been like that my whole life.