So I guess we can only suffer a casualty while at GQ.
Well I don't make up the material readiness conditions, but I'm hella glad we don't steam at Condition 1 (General Quarters) 24/7.
If anything, there's probably a feel-good or other psychological considerations to the battle dress. Coveralls tucked into socks may never have or might never do anything physically beneficial, but its role may just be an important part of the choreography of combat readiness. General Quarters eventually became a fantastic time for me to catch up on my reading, but there was no doubt about being in a heightened state of readiness in part because my pant legs were tucked into my socks.
It's kind of like there being "no real reason" to stick recruits into the confidence chamber at RTC other than to make their life suck even more for half a day, but there probably could be some actual benefits related to combat readiness when people during heightened MOPP levels don't have freak-outs when wearing their gas masks.
But in all honesty, you're just splitting hairs. There are different levels of readiness for a reason and virtually every prescribed action in the Navy has a bona fide purpose to it.