Comment 3 for bug 1603458

listeners and pools are no longer 1:1, at least indirectly. A pool's "real" parent is now the load balancer because with L7 rules, a listener can have a default pool AND indirectly point to other pools via L7 rules.

I personally would prefer to have the API delete everything underneath a particular resource if everything underneath is "empty". However, there are also use cases some have brought up of a listener not pointing at all to a pool. So it's a tough question to answer.