Slight misunderstanding I think. The .deb camp complains against the prohibition of post install scripts that are interactive in rpm, i.e. debconf. But without that iron rule automated updating isn't practical so it is hard to argue for the Debian Way on this one. Packages should be able to install without asking questions and they darned sure should be able to update without them. And since new dependencies tend to spring up in updated packages any update has the potential to install a previously uninstalled package.