Sven, It was a conscious decision (on my part) not to remove the conffiles at this stage. Whilst I accept this leaves cruft on systems that don't have bin:initscripts installed, it has the benefit that user modified conffiles are preserved during the transition to initscripts, as required by the Policy.
I think this cleanup can happen saftely in the Forky release cycle. For reference, the udev maintainers have recently tried this cleanup at an earlier stage and it has not been straightforward. Mark