Because there are factors outside of pure defensive protection, which are also high priority. Weight load, mobility, ease of use, etc. It’s all a trade off of one vs others.
If I have a full upper torso protection, with plates on all sides, but I can’t run/duck/crouch, I’m just going to get shot/blown up when I take fire.
In the US military, we don’t even typically use a lot of the parts of the armor we have. We typically prefer the lighter weight and easier movement vs a little more side protection, crotch guard etc.
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