If you were to change the Debian docbook-xsl package such that it uses /etc/papersize as a default papersize instead of using "letter", as the upstream docs say, then you run the risk of a users discovering that every time they generate FO output, they are getting a different default thatn what the upstream docs say they should be getting, and them perhaps having no idea why that is happening. I suppose that if you implemented this, we could update the upstream docs to say that the default is "letter" except on Debian, where it's whatever is specified in /etc/papersize. But we've never put anything system-specific into the upstream docs before, and IMHO, this wouldn't really merit a setting a precedent for doing that.
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