I would guess no one has asked about it before because we gently discourage clients from relying on IP banning in our platform. In fact, I would hope someday it is phased out.
It is not really a reliable way of controlling access in the modern internet specially as IPv6 becomes more popular. If you do need to IP-ban, it's better done at the firewall level on your network as that is what your firewall is good at doing. IP-banning in our platform I would argue is a bit of holdover from a different era of the internet.