...and raises cogent issues regarding his choices.
Some riffing of my own on the topic:
1) Shotgun spread at in-home ranges is not enough to endanger the Rembrandt over the fireplace. Similarly, it is also not enough to overcome sloppy marksmanship.
2) The "shotgun racking" warning is the same as the "safety snicking" or "SureFire lighting" warning: In other words, it's not a warning, but a preparation for firing. If your preparations to fire incidentally cause the enemy to flee, wave 'bye and smile, 'cause you won.
3) Be careful about overgeneralizing the "don't use an expensive gun" caveat: A used Glock may be irreplaceable to a young householder. If I lose a kilobuck-plus 1911, no mas, I have more. They're all cheap relative to a good guy's life.
Myself, architecture and the fact that I'm single has dictated my strategy and choice of guns; I'm gonna fort up in my bedroom on one end of the house with the SureFire-equipped carbine and wait for the cavalry to arrive. If my house was laid out differently, or located elsewhere, or if I had a family, those would no doubt influence my choices.