Thorsten,
① The other sort of removals (drop binary packages that are no longer built from source packages when a new upload of any binary packages from that source package happens), dpo mini-dak does *too* eagerly: it doesn’t check if the old binary package is still depended on before it gets removed. Case in point, libdb5.1.
Didn't dak use to do that, too? At least for arch: all packages I distinctly remember quite reproducible breakage from package removals that were considered obsolete (for ia32).
Good to hear little changed, really. Cheers, Michael