The 19th Century British notion of parking onself in a line and destroying the enemy long-range with superior marksmanship is really obsolete (though it hung on with the British and us through WWII).
Battle rifles should be reserved for "special" applications.
Bingo! "Adjust fire, over" will kill a lot more effectively than a bunch of riflemen, and at less risk to the attacking unit.
The problem comes in when you're talking about combat where the troops
don't have CAS/ARTY resources to back them up.
And surly, for most people if you did choose a rifle for protection a battle rifle cartridge's bad points would out weigh its merits. To me it seems other than sniper or machinegun use, the main battle rifle cartride is obsolete.
Here's where the differences in opinion come in: what're you trying to protect against? If it's bear most would argue that the 308/30-30/303 battle rifles are going to drop him more effectively than the 22's that today's armies are fond of.
If it's you against the marauding hordes then you can make the argument that a sporter in 308/30-06/300-Mag/etc would increase your survivability as you can take your shots from outside the effective range of the battle carbines and move on to your next position.
If it's you and your buddies against a better-equipped foe, the argument can be made that the rifle cartridges are more practical. The only damage you're going to deal is going to come from the muzzles of your weapons, and something like a .308 is better at hitting enemies (think disabling vehicles, shooting through cover, etc) than a .223.
If your goal is to shoot a lot to keep the enemies head down, a battle carbine is a better tool than a battle rifle. If it's your goal to
hit the enemy and make sure he stays down, IMHO something like a Garand/M14/FAL has it all over the AR-15's of the world.
For home defense, neither is appropriate unless you're expecting armored intruders...
All in my opinion, of course.