Native dark modes are better

Agreed. Well, I don't know if it'd deal with random images as well, as users can upload those.

and have much less of a performance impact.

For a number of sites, you can just get away with running Dark Reader in static mode and it works well enough. Considerably faster.

EDIT: Actually, thanks for reminding me. I've never donated to Dark Reader, and it looks like they ask for a $10 donation if you use it regularly, and that plugin has dramatically improved my Web-browsing experience. Going to do that now.