If I was in the situation of defending my home from intruders I would prefer to take more of a stealth approach such as hiding out in the grass, outbuildings, trees, and sniping them off one by one with a .223 as apposed barricading myself in and using a machine gun or something -- but that's just me. If they were already in the house then I would use a 12 or 20 guage or a 9mm. There are plenty of stories about people defending their homes with a .22 but there just isn't much stopping power with them. I'd love to have a 30-06, I went to a guys place a couple years ago and tried shooting down tree branches with one.
see there's the problem... if you were in a position to *have* to defend your home, you very well may not have any time to choose your method...
there's three general scenarios here...
one is that you a) know there's a collapse or some such going on, b) have prepared in advance, c) have a way to be alerted when you are about to be under assault and d) have time to get you and your family home, and e) have time to prepare. that's going to require communications and ability to travel, or perimiter alarms, or a warning system of some sort.
scenario two is a) you know there's a collapse going on, b) have prepared in advance, and c) have no way to know when you're about to be under assault or have no time to respond to that information.
scenario three is a) you don't know that something is going down, b) have prepared anyway, and c) get supprised in your tracks.
your prefered approach only works in the first case... scenarios two and three are, I think, far the more likely of the three situations, and both require walking around prepared all the time, ready to do battle on the spot, with no notice. they would require a mounted defense at all times to deploy your preference. scenario three also requires you to figure out that something is happening without outside information and in the moment, under pressure, with, theoretically, your family's lives in the balance. in which case you won't be staked out in the weeds, and your preferences really don't come into play at all.
I think preparedness is not only about EOWAWKI and Waco Texas, but also about huricane Katrina (where law enforcement disarmed people who were still in their homes), and riots and home invasion robberies. in that last item you may have no warning, and no prep time, and all your decisions may have to be made on your feet, and your defense needs to be done with what's on your body at the moment.
Aside from that, consider some other contemporary situations... although not so much a problem in the US right now... a friend of mine and her husband were visiting his family in India and they had a home invasion robbery... conducted by armed and uniformed police officers. now you not only have the on-your-feet decisions to make, but in the face of apparent authorities. at first, she says, it was not clear it was a robbery, they conducted it like a police raid. so someone looking like cops break into your house, looking and sounding like authorities, with no notice and no prep time.
it's an extreme example, but as I said, preparation to me is, in part, to conteplate the "what if" thoroughly, and mentally pre-plan options, to consider how to assess a situation on your feet.
I'm a shooting instructor, and while I was living in CA the "tactical" shooting classes were geting a LOT of traction. there's a lot folks who want to explore the "combat" side of shooting. most of the trainings, allways filled with a waiting list, are so far from anything actually tactical it's kind of like playing dress-up. but hey, it's a fun day shooting, so it's all good. except maybe it leads folks to think they're more prepared than they are, and that might lead them to not prepare as fully as they would if they understood.
I think a lot of folks strategic planning is probably more of the let's play cowboys and indians variety - stimulating to think about but ultimately not very likely to work or to even be useful in 'real' situations. I think very few folks train under circumstances that come even close to the kind of shock and adrenaline they would actually be experiencing in *any* of the scenarios people envision they'd be preparing for. should there be an EOTW scenario, I think a few folks will be lucky, a few will be lucky and prepared, a very few will actually be prepared enough to not need to be lucky.
Personally I think a tornado is far more likely than EOTW. I think riots are a remote possibility, and a water/power/food shortage due to winter storms is fairly likely, at least for short periods. from a preparedness standpoint, most of my friends think I'm at least clinically diagnosable as paranoid. my take on it is this:
I may be paranoid, but that's not proof they're *not* out to get me...
and...
What is called paranoia today may be declared prudence tomorrow.
I do what makes me feel calm, preparedness wise. that means having means, skills, supplies, plans, resources. aside from being prepared, those are things I genuinely enjoy doing, and would do even if I lived with certainty of plenty and peace and uninteruptable supply sources. I figure since it harms noone, it's a fine hobby, good for the economy, and keeps me off the streets and out of trouble at night.