Flamestrike
Legend
This is kinda mythology.
"An entire suit of field armor (that is, armor for battle) usually weighs between 45 and 55 lbs. (20 to 25 kg), with the helmet weighing between 4 and 8 lbs. (2 to 4 kg)—less than the full equipment of a fireman with oxygen gear, or what most modern soldiers have carried into battle since the nineteenth century. Moreover, while most modern equipment is chiefly suspended from the shoulders or waist, the weight of a well-fitted armor is distributed all over the body. "
It's also padded for comfort. It's really not that bad.
It really is that bad when you're wearing it for prolonged periods of time.
As someone who has worn armour as part of my job, I can assure you that even in Afghanistan (and it doesn't get much more dangerous than that) you aren't walking around the rear echelon in your plate carrier and helmet.
It's totally different at a FOB or once you cross the wire of course.
Historically soldiers (from Spartans to Viking to Knights to Samurai to SF Operators) don't walk around the place wearing heavy armour unless they're about to go into battle. It's heavy, it's hot, and those 20kgs starts feeling a lot like 100kgs after a few hours.
It just doesn't happen.
Put a 20kg backpack on your back. Walk around with that on your back for a few hours. Let me know how you get on. Then let me know how you feel at the end of the day with it on your back all day long.
And it's not just physically uncomfortable; it's also socially unacceptable. In much the same way if I wore my plate carrier and helmet to my local Shopping centre to buy some groceries.