My understanding of that article was that it was not necessarily about duplicated code, but duplicated data. If you have two places storing the same data, and different parts of your app go to each of it, you need to somehow keep them in sync, and that’s often a pain.

I’m trying to be very rigorous about avoiding that, duplicated code I’m a bit less rigorous about.

This right here. I’ll gladly take less pay in Europe than constantly having to worry about my health and whether or not that bit of pain you sometimes have in a weird area means a hospital bill you can’t afford. And even if I loose my job, I know I will not starve, because of our social security system. It will not be fun, but I won’t loose my house or worry about what to eat tomorrow just because I got unlucky and my company went under.