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(the belt or strap locate at the middle side of the breastplate or the plackart)
Won't the belt become easy target to be cut or to be worn out? Making the armor prone to break up or unable to cover properly because it's getting loose during battle?
examples (click to enlarge):
image from pinterest
image from https://steel-mastery.com/milan-style-full-plate-armour-1450-1485-years.html
Assuming you're talking about the diagonal belt across the hips, that is to support the sword; it is not critical to the integrity of the armor.
As to the other straps, as @Daniel says,
I think he's referring to the straps on the lower edge that hold the tassets in place and the ones front and back that hold the plackart and lower back piece. Given that the tasset straps were still being used in the 17th century on half armour there doesn't seem to have been much of an issue with these straps being cut. As for wear, these armours were maintained so straps starting to wear would be replaced before they could fail.
While the exposed belt holding the placard in position might be destroyed by the opponent, you have to ask yourself: is it worth it?
Destroying the belt will have some effect on the knight, since the placard will not sit in its proper place anymore. However, I doubt that the knight will be severly hampered. Reenactors with a suit of armour of this style could easily test this.
On the other hand, if you attack the belt, you are not attacking the knight. This opens you to counter-attack.
So, my guess it that the belt is a low-gain, high-risk option for the attacker. Thus, there is little need for the armourer to protect the belt in any way.
