We currently only generate ddebs for the most recent versions of packages in the archive. With the new crash database, we receive a lot of core dumps which we cannot completely retrace because of this issue (https://errors.ubuntu.com/api/retracer/results). For the Launchpad-reporting side of things, this results in an ugly "cannot report this problem" dialog.
IS is also not happy with the manner in which this is currently implemented.
Let's get ddebs support into soyuz.