Anonymous
public text v1 · immutableWiki pages that help justify the policy:
https://wiki.ubuntu.com/Ubiquity/Automation
https://wiki.ubuntu.com/AutomaticUpdates
https://wiki.ubuntu.com/DapperGoals
Debconf reasoning:
http://www.fifi.org/doc/debconf-doc/tutorial.html
Also, search debian mailing lists about debconf