Comment by jorvi

I can virtually guarantee that the amount of people getting annoyed at being flashbanged by HN is larger than the amount of people that would complain about a dark mode.

For users without an account you just stick to prefers-color-scheme. For users with an account you add a setting 'disable dark mode'

Dark Reader has autodetection so those users won't be a problem either.

And if you really wanna keep to the identity of the site, the top bar doesn't even really need a color swap.

It really is less of a conundrum than you think.