Well, multiple armed assailants breaking in at night when they figure I must be home is highly unlikely, since I'm not a drug dealer.
This is actually an increasingly common group offense now, and not just against drug dealers.
Need I remind you of the Cheshire home invasion of a decade ago? Non-drug dealer victims attacked by multiple firearm-toting assailants. That was just one of a seriously growing crime trend - armed home invasions are apparently the popular thing with some criminals now.
I'm also more proficient with a handgun than a long gun.
Sounds like a personal problem. You should fix that.
Plus 16 rounds with spare mags next to the gun isn't exactly a poor choice. Anyways, my biggest concern is space - I'm not convinced I can effectively maneuver around some tight corners in my house with a long gun.
You do know that non-ARs actually have folding stock options so they can be more easily maneuvered in tight quarters, right?
Makes this job a lot easier and is one of the reasons why a short shotgun with a folded or even removed stock (pistol grip only) is still sometimes called a "cruiser" configuration - the short, folding/no stock shotgun was developed to be carried in a police cruiser to be used in just such situations. Many of the early commercially produced ones didn't even have sights as their main intended use was to be fired from the hip or a close retention hold with the top of the weapon nowhere near your line of sight. That's the kind of close quarters fighting they were intended for; a well trained operator can be surprisingly accurate at house clearing ranges with hip fire on a shotgun. Unfortunately, due to bad media portrayals, that fact gave mistaken credence to the already-existing myth that all you have to to is wave a shotgun in the general direction of an assailant and pull the trigger.
Should you come across an assailant while clearing the house, a long arm is easier to retain and as its barrel is fixed an attacker grabbing the barrel cannot push the weapon out of battery thus rendering it non-functional. One retention technique (of many) if someone grabs your long arm's barrel (especially on a shotgun) is to simply pull the trigger and let the muzzle blast do the job of getting them to release the firearm for you. There's other related nastiness that you can do if the shotgun is a semiauto and you therefore don't have to manually cycle the action.
My thinking has always been that if there's a bump in the night I need to investigate, I'll do so; if I actually believe someone is inside, I'd rather hunker down in the bedroom - for the former, a handgun is perfect; for the latter, I'm thinking a long gun might be wise. Let's face it, if I got my hands on my AR, g-d help whoever is coming through that bedroom door.
And whoever is 300 yards or more beyond the muzzle when you pull the trigger.
That said, you have the right general idea - house clearing is only to be done if you absolutely have to, it is better to defend your bedroom or other central point (i.e., set up an ambush) than to go to your potential assailants. On the other hand, sometimes there isn't really a choice.
It's just a shame you have the details wrong IMHO.