It depends on content also, when reading books I tend to use light mode with brightness lowered since it makes me easier to read and relaxed?, But for other content I mostly use dark mode

Memmy has an option I love. You can chose a any theme for system daytime and a different theme for nighttime. So I chose Dracula for day time and OLED dark at night. The full black OLED theme is too flat for daytime but the dark Dracula is perfect.

I have photophobia (and photosensitivity!) so dark mode is the only tolerable way to look at things for me.

Since dark mode has become a lot more prevalent/accessibile there's been a notable reduction in headaches/migraines for me, especially in conjunction with 'night light' settings, and an anti-glare glasses coating.

I recently switched to dark theme depending on the time and I would say the reason not to use dark themes entirely is you don't get the contrasts you can get with light themes, setting the mood and I guess 'theme'.

Dark mode helps minimizing any eye strain, plus its cool af.

All of the above. Plus, it's a little more aesthetic (most times), easier on my eyes since I wear glasses.

Light mode works for some things, but most of the time dark mode is the way to go.

I just find light themes disgusting looking. But that's just personal preference