It's such a mindset shift to work on software that has exactly one user.

Sometimes I catch myself thinking things like, "What if the user passes a string containing a hyphen here?" Then I remember that the only user is _me_.

This particularly thing (static site generation script for my blog) is also >10 years old and I touch it once or twice a year.

That also entails a whole different set of tradeoffs than “normal” software.