The only feature I'm missing is dark mode. On all my desktop browsers I've got custom stylesheets I hand-wrote to keep HN from burning my eyeballs, but on mobile there's nothing I can do about it.
Is there a reason you can't use a browser that has a built-in dark mode? I use "Samsung Internet Browser Beta" on Android because it has a dark mode, as well as good ad blocking. Might there be a comparable solution that would meet your needs?