There is a big difference between mac-v-sog work and home defense.
A handgun in a moderate caliber is all a practiced shooter needs. Large diameter subsonic rounds like 45 ACP, 45 Colt, and 44 SPL will do the job with less damage to the shooter.
Much of the AR self defense craze is created by video gamers and Tom Clancy fans trying to justify their equipment.
I want my handgun and a free hand in that situation.
Unlike many people, I have been there. The 1911 was good enough to resolve the problem.
On that day John Browning trumped Louisville Slugger.