Knitter and Graphic Designer Zabet Groznaya says:
When in doubt about fonts, go conservative. Times New Roman, Arial, and Helvetica maybe boring, but they are clean and easy to read.
This was the advice I used when I first started publishing, partially because it was the most common and made the most sense to me.
A few pages later in the book there's a reference to this source: http://practicaltypography.com/
If that’s impossible, you can still make good typography with system fonts. But choose wisely. And never choose Times New Roman or Arial, as those fonts are favored only by the apathetic and sloppy. Not by typographers. Not by you".
And yes, I've heard this advice many times after I chose the conservative fonts.
I'm asking because I may update my basic pattern format in the future. Which expert do you agree with? Is the font something most knitters even notice? I consider simple and readable to be the most important factor, but do you?