That's exactly why it's a problem. If you have 3 hosts and 2 of them go down, in this setup there is more than 50% chance that cached hosts will be trying to c

That's exactly why it's a problem. If you have 3 hosts and 2 of them go down, in this setup there is more than 50% chance that cached hosts will be trying to connect to a non-existing server. Also expecting client to perform a DNS lookup every time there is an outgoing log packet is pretty shitty for performance. You can't guarantee near instant DNS server availability for every client.