"All of my Fallkniven F1s have small guards"
They do... but when using them in Mitts and inner gloves in -30 Deg C to chip through ice to set some night fishing lines...you would be suprised how bad the grip is...you definately need to use a lanyard which is a real fiddly thing to use in those temps with mitts...if you have a ski glove or a proper Artic Mitt try using one of your F1's after numbing your hand...then try using the S5...it is a LOT better with a much bigger grip...
I used an "issued" F1 in Sweden on a Joint Services Survival Course and found it "difficult" to say the least...and ALL the instructors ... including Lars Falt who ran the course and is quite famous over here for his TV "guest" episodes with Ray Mears.... had "personal" traditional Scandi knives with much wider wooden grips....which they acknowledged worked a lot better...
I don't believe I would want a white knife in arctic conditions. The orange contrasts just about everything.
In civvi use yes...bright orange is better .... but not in a military role...