I read the linked article, and would like to address a couple of the points made, in practical terms.
First, the 30rd AR vs the 10rnd Beretta. More is better, right? But why do you have a 10rnd Beretta? Is it because you live somewhere the law says 10rnds is all you can have? If so, then you won't have a 30rnd AR.
Next, while there is no argument that the AR with the right bullet, penetrates less through walls, with any other bullet, it penetrates MORE. And I find it a very likely thing that someone who is not well versed on the difference will buy whatever the store clerk hands them, FMJ most likely. There goes your penetration "advantage".
But mostly, consider this, have you ever fired ANY weapon in a dimly lit (or dark) room?...
Seriously. If it all possible, see if you can experience this, with your chosen HD gun, BEFORE you decide for certain.
Imagine someone flashing a strobe light in your face from just beyond arms reach, combined with slapping you in the face with a pillow. And that's WITH hearing protection. Admittedly this problem happens with all guns, but a short barrel AR is worse than some in this regard.
And that brings us to the "multiple intruders". Who are not going to stand still and be shot, not going to wait for your vision to clear from the muzzle flash, and may even shoot back!
While it is of no concern during the actual fight, every round you fire goes somewhere, and you are legally responsible for them all.
And sticking with the legal issues, are you justified in shooting? Some places just the fact that they broke in is enough, in others it is not. Know the law where you live.
THINK about things, beforehand. The AR points well, is light, has low recoil, and so is easily fired fast. Can be used by women quite well. BUT, there are risks to this, as well. Mostly after the fight risks.
Consider this variant of the situation, 2AM, half a dozen intruders in the kitchen, Mom grabs the AR to save the family, (Dad is working nights), confronts them, one of them has a gun, points, maybe shoots, Mom opens fire, and shoots until she can see the threat is gone. Maybe the whole mag. (Mom's training has been a range session or three, and what she sees on TV, all the time)
Mom saves the family, and faces one justifiable homicide and 5 counts of MURDER. Farfetched? sure. Outside the bounds of possibility? I don't think so.
Could something like this be even remotely possible in your situation? THINK about it. Same exact situation, except Mom, grabs rifle and kids, hunkers down behind a locked door, prepared to repel boarders until the police arrive. Different tactics, much different result likely.
THINK ABOUT IT!
I'm not saying the AR is a bad choice, I'm saying what you DO with it (or whatever you use) matters more.