Hi, thanks for reporting
even if there is no definitive policy regardind the purging of system users, there is at least strong concerns against this because of security considerations[1], so for now I won't change the behaviour
But I agree that the directories should be removed, I have uploaded a fix addressing this
Peymaneh [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=228692
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