OK then--ask Joe if he would like to be armed in that manner---see how many takers you get. Joe's outcome may have differed. *BOTH* weapons mentioned are MUCH more powerful round for round than the current M-4 / M-9 offering. Make that .45LC a 1911, and the choice for the pair becomes very easy for many.
So what are you saying? The 1911 and the Garand are preferable to the M16 an the M9, or not?
Here's the point I was trying to make. The vast majority of
Joes in the first Gulf War
never fired a shot an Iraqi soldier. Not even once.
Why? Because Saddam hunkered his Army down, dug trenches, and expected our Army to slog through it all. Instead we bombed his ass for six weeks. After that onslaught, in which something like thirty thousand Iraqi soldiers were killed, the majority of the survivors wanted to surrender.
Of course having modern weapons will help the soldier in a firefight. But single firefights rarely determine the outcome of battles, and individual battles rarely determine the outcome of the war.
Machine guns are more important than rifles. If your squad has all AR-15s, and no support weapons, you'll likely have a hard time defeating an opposing squad that has M1 Garands but a pair of belt-fed machine guns. Magazine-fed weapons can't compete with belt-feds in the fire support role. As a general rule, given equal training, the side with the most machine guns and other heavy weapons will win. Mortars, light artillery, things like that...these determine which side wins battles. Then there's the support provided by infantry fighting vehicles, tanks, helicopters, and jets.
On the flipside, imagine the Germans in 1944 magically being re-armed with HK33 .223 rifles and HK21 .308 machine guns, replacing all of their Mausers, MGs, MP-40s, etc. The Allies would've had a tougher go in some firefights, but it wouldn't have changed the outcome of the war. They were still overstretched and being constatly pounded from the air, trying to fight a war on two fronts without the industrial base to maintain it. Those HK33s wouldn't have helped them against the relentless Allied bombing campaign, nor would they have stopped the thousands of Soviet T-34s coming at them from the East.
Now, keep the Mausers and the MP40s, but replace the Me-109 with the F-4F Phantom that (I believe) the Germans still use and their Panzer tanks with Leopard IIIs.
Now all of a sudden the Allied tanks don't have a ghost of a chance (their shells literally bouncing off the armor of a modern tank), and our fighters and bombers are being massacred in the air. Germany now can stop the onslaught, catch its breath, and regain the initiative.
Do you see what I'm saying?
It's intersting to note that despite the Germans having inferior rifles (the manually operated Mauser can't compete with the autoloading Garand), our infantry and theirs were pretty evenly matched. Although our rifles could maintain a higher rate of fire, they had lighter and more mobile machine guns, and that had a decisive edge many times. Their downfall was they couldn't produce enough of them to matter. However, they were the first to use the "universal" (general purpose) machine gun now used by every army in the world, while we were getting by with overly heavy, magazine-fed automatic rifles and tripod-mounted medium machine guns (both holdovers from the Great War).
As for the M1/M14 vs. FAL in cold...it gets every bit as cold in Upper Michigan as it does anyplace in Korea. I never had a problem with my STG. The Canadians used the C1A1 inch-FAL variant for decades, and they know a thing or two about cold weather, I'm sure. You just don't use lube, is all (because the lube turns to thick goo and gums things up). The FAL will run dry.
I don't think either the M14 or the FAL have an advantage over each other in the reliability department. I do think the FAL is more soldier-proof than the M14, but both rifles reflected neatly the doctrines and attitudes of the armies that adopted them. Each one probably has quirks and disadvantages that the operator needs to be aware of, though.
As for the Israelis, I have no idea. They, with their domestically-produced FAL variant, are the only ones that seemed to have had much problem with it.