Every now and again I mention my ownership of a carbine-length AR and immediately receive comments on the superiority of rifle-length 20" A2's for everything from shooting guys on distant hillsides in Afghanistan to winning DCM matches.
You know, I have no intention of competing in any high power matches with this carbine.
Nor either am I likely to find myself in Afghanistan with it.
Fantasy scenarios about roaming the zombie-infested wasteland with a colander strapped to your face and Ol' Bess attached to your bicep with a DCM-approved loop sling are all fun and fine, but they're not exactly the most plausible situations in the world. Apocalyptic idylls aside, that's not how I'm ever going to be using my long gun.
The most plausible scenario for me to need a long gun is somebody breaking into my house with enough warning for me to fetch a gun, in which case I'm going to grab a long gun and not a pistol (since a pistol is for come-as-you-are gunfights; if one has time to dress for the affair, one should perhaps consider something with a shoulder stock.) I'm not going to need to sling up or worry about flatter trajectory and wind values at 300 yards, since the longest possible shot in Roseholme Cottage is closer to ten yards, and is likely to be a lot closer than that. I'll be more worried about sight offset than trajectory.
The other possible scenario where I might need a long gun would be some type of Katrina-level natural disaster or urban unrest. Look, I live in a moderately-wooded, flat-as-a-pancake, urban area. There's hardly a structure over two stories within a mile of where I'm sitting. The only way I could even see over a hundred yards in a straight line is if I stood in the middle of the street, which is something I would not be doing. The other thing I wouldn't be doing is going looking for trouble; I'll be sticking right here and keeping an eye on my own patch and helping the neighbors.
So, while I appreciate your concerns, my carbine is just fine for my needs. Your needs may differ.