As others have mentioned, it's Larian's design choice to make everything *look* like dodges, and it's silly.
But you asked about the AC mechanic... The AC *mechanic* is that AC represents the total accumulation of you ability to avoid being hurt, whatever that means. If an attack roll does not meet your AC, that means that, whatever else happened, it failed to cause you harm, or you managed to avoid being hurt. It does not inherently mean you dodged; the mechanic doesn't specify how harm was avoided, just that it was, and the how of it is between you and your DM. The character wearing +3 plate armour with a +3 shields and the Dexterity of a head of cabbage, still has 26 AC because they're a nigh impenetrable fortress of metal. When hits fail to damage them, it's generally going to be because the armour stopped it - though it may also be because the attacker just plain missed, too, or any other outlier reason. Armour does protect you - that's what AC is.
Larian made everything look like dodges all the time, and that's pretty dumb; blame their visual design choices for that.
but sometimes armor stop like 50% of impact force so weapon pointed at you slow down in armor and hurt you much less by physical rulez and game show only 0 1 code
1 - hit 100% damage
0 - miss 0 damage
never something between like geting hit for 20 dmg and absorbed 10
sometimes armor stop weapon just by half or like 80% impact before hits you that why you have only dodge mechanics here are armors are not armirs just robes with dodge chance
