Nope, I want to make grand whoosing sounds, followed by the sound of melons hitting the ground. Otherwise silence in the darkness.

Announcing yourself is tactically a bad decision, but it might be what lets you sleep at night afterwards. I'm not going to kill anyone over a TV. I'll give someone every chance to run away - it's only when they move towards me or mine that causes me enough concern to be willing to kill them.
I acknowledge that this places me in greater danger. It's obviously a decision everyone has to make on their own according to what they can do and live with afterwards.

Understandable, but at what point do you conclude an intruder is no longer a threat? I prefer to be proactive in defense rather than reactive; it gives me more options and a greater chance of survival.

Better to err on the conservative side, and just assume that if someone has broken into your home, it is with the intent of doing you and yours great harm. You are certain, then, not to be unfavorably surprised, and still remain justified in your actions.

Nonetheless, I agree that the best time to warn an intruder you are armed is when the sear lets go.

It's a good question. How far away does a person have to run to no longer be a threat? Outside? Down the street? Just out of sight? At what point are you sure that the bad guy isn't just doubling around the back side to come at you again?
I still have enough faith in my police to call them. I'll put down my weapon when they are knocking on the door.

Legally, I believe we can consider them a threat until they leave the house, so long as they disengage any attack posture. If they persist with the confrontation but are merely driven outside, then the threat remains imminent, and justifiable defense is warranted. Doubling back may only lead them down another path of doom. If they don't get the message on the first volley, they surely will the second one! Give me a chance to reload/rearm, and I will likely get something bigger and more powerful, as well as take up a more advantageous position from which to deliver.

It's been my experience that the police are not there to protect and defend, unless you happen to live next door to a police station. Usually they are there to secure the crime scene and help clean up the mess after the fact. I have no problem with relaxing my attack posture when properly identified officers show up at my home in response to being summoned.