When I try, I get error messages similar to:
Can't remove entity [User: id = 18-30[up-to-date] (RemovedSaved)] with incoming links: 1: Issue: id = 55-870[up-to-date] (Saved).reporter 2: IssueComment: id = 61-1346[up-to-date] (Saved).author
And now I see there is a youtrack youtrack item about this from the past:
but this seems kinda silly - I should be able to remove a user so he/she doesn't count against the total number of users yet their old interactions are still attributed to them.
If for example I merge them with guest, and do this repeatedly as users leave the company for example, I will lose the audit trail of who said what.
Seems there should be a better story here.