This simplest way to put this is time and weight. The longer you wear the given amount of armor, the less of it you can afford to wear and still be able to function.if we have to discus modern Amor suit, this is a must.
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Kerberos Panzer Cop and Jin-Roh: The Wolf Brigade by Mamoru Oshii
This german armor suit is used in WW2 in Oshii TL
About usefulness of modern armor: the question is against what you wanna use it ?
protection against enemy bullets ?
without modern technology like lightweight Kevlar
The armor will be heavy very heavy Steel and for a blitzkrieg infantry is this literal death weight...
The modern AMerica MICH helmet and MOLLE vest is about the best we have. Light, reletivly resistent to most flying pieces of random metal and the Soldier can wear it for long long hours, and even days if she has to.
It also let's her put most of her carrying weight in food, water, sundries and ammo where they belong.
The guy i nthe pic LOOKS really scarey, but if myself and my squad are wearing modern ACU MICH, and MOLLE gear that dude is smoked, the lady I have on our M249 SAW can cut his legs off for him and then where will he be?