As my granddad used to tell me, all the training in the world won't save you if you don't wake up before the burglar gets the drop on you.
The same people who go out and spend an obscene amount of money putting together a 'professional' quality carbine for home defense are the same sort of people who only have a simple dead bolt between them and the bad guys trying to break into their home. If the pack of thugs performing a home invasion on your house kicks your door in at 2am, they're going to be bum rushing your bedroom and you're not going to have the time you think you do to put your Gucci shit on.
Without power leveling too hard, a friend's dad is the sort who buys a shit load of guns and then posts about them on Facebook. Some white trash kids figured out where he lived, kicked his door in, and rushed into his bedroom and beat the ever living shit out of him, before he could ever grab the pistol on his bedstand.
You have to give yourself time to both get ready to fight and to wake up. On the opposite end of the spectrum, a police officer buddy of mine responded to a shooting where a dad accidentally blew his son away, because he came home late at night and mistook him as an intruder passing by his bedroom door. He hadn't even gotten up and out of bed by the time he drew his pistol and shot him.
Reinforce your entry points, put barriers between you and your front door, and forget about being Meal Team Six and clearing your house: if you don't have kids you need to get to, fuck that shit, that's what the police get paid to do. Hide in a dark corner of your room with your wife or anime body pillow and pop whoever comes through your bedroom door.
In the 1990s and early 2000s, shotguns were the ideal tools for home defense. Now we're onto home defense carbines with fanny packs filled with enough spare magazines to make you famous if you live through that gunfight. I wonder how long before we go right back to simple shotguns reigning supreme in the 'tactical' world.