As I found out earlier today, users who are deleted have their negatively-scored questions deleted, even if those questions have upvoted answers.
This goes against established conventions, for two reasons:
As moderators, we constantly tell users that we won't unilaterally delete questions that have upvoted answers.
Even our FAQ states that we don't let users delete their own questions that have upvoted answers. See also this.
This 'delete my user' process allows a user to get around this policy by simply deleting their own account. Since nothing stops them from creating another account, it's quite possible this harms our mission of keeping good content around. Also, it allows users to delete their own questions whose answers have received bounties, which can take away the bounty award; this behavior was recently prevented for normal question self-deletions.
I propose that we make changes to the user deletion algorithm:
If a user is deleted and they have questions with upvoted answers, those questions are disassociated from the user's account instead of being summarily deleted.
Questions without upvoted answers are treated like they are currently: they are deleted when the user is deleted.
This should be the same for destroyed users as well.