I personally belong to the dark theme cult, but this spring we had to rent a flat for a while where ambient light conditions were just horrible. For the first time in my life I just HAD to use light themes everywhere because dark themes would just make my eyes hurt after a while. So maybe people who prefer light themes just spend most of their time somewhere with dim uneven lights?
I live in Australia, very sunny most of the year. Light theme feels like I'm shining a flashlight into my eyes even during the day. I just don't understand light theme.
My 5 year old laptop's screen is so dim that on bright days you fully can't see dark mode, but my phone and monitor work just fine on dark mode on all but the brightest days
True, I was thinking about phones only. Honestly I can't imagine using Office in dark theme, but even my computer is set to dark themes wherever possible.
I'm fairly normal, I think. Is it possible that some people just don't know there is a better option? My partner had no idea and I had to set her phone on dark theme after she saw mine.