I'm surprised to hear that. I think it looks like a straightforward inversion of the light-mode, which you aren't complaining about, and generally, people seem to like it & I see lots of screenshots of it on social media.
Are you sure there is not a bug? Could you describe what is so bad about it or upload a screenshot somewhere? If you'd prefer to do this over email, I am <gwern@gwern.net>.
I haven't noticed, because I don't use dark mode, instead relying on dimming brightness and contrast of my displays while having soft and warm background illumination :-)
In light mode I miss some color themeing, like soft/warm something yellowbrown/manilapaperstyle instead of that hard black&white, but it still 'works for me' that way.
Are you sure there is not a bug? Could you describe what is so bad about it or upload a screenshot somewhere? If you'd prefer to do this over email, I am <gwern@gwern.net>.