Comment by bayindirh

> do printers sold in the US default to US letter sizes when printing? Or just happens to be something FSF only seem to be doing?

Yes, the default printing paper for US is US Letter. I prefer to use my computers with US English language, and macOS defaults to US Letter as print and page size when you use US English as the default language.

Moreover, I had a ream of US Letter paper in the past, given me by our neighbor (I live in a A4 country, so it's that "odd" size).