Given that IF is largely text based, I find that not enough IF projects (and default engine settings, for that matter) care about font legibility.
Replaying a game to find out every possible ending doesn’t excite me.
Dark themed interfaces are hardly ever done right. Light text on a dark background needs thinner weighted fonts, for example.
A comfortable paragraph width for reading is not a physical dimension of the screen, but a restriction to 60-75 characters, regardless of font size rendered.