The rule predates my appointment to staff, but one reason is that it prevents the person you put on ignore from contacting you by PM. As staff uses PM to communicate official business, it is necessary for any staff member to contact every member by PM.
It also prevents a member from seeing in-forum official notices.
For what it's worth, staff can't put anyone on ignore.
It also prevents a member from seeing in-forum official notices.
For what it's worth, staff can't put anyone on ignore.