A lot of software is dark-mode first but it's still not right. Good dark schemes are just really hard to design, there are just too many nuanced differences. Color perception is maybe 10% of it. Typographics, line thickness, optical balance, accounting for massively increased contrast, antialiasing, layout, picture rendering, absolutely everything should be done differently on dark backgrounds.

And it depends too much on your environment, the type of display, and its pixel density, unlike in light mode which is way more forgiving to external factors.