questions

If the person you are fighting has 'no effect WHATSOEVER' when they hit you then why does it still damage your armour?

Because your armor is still getting hit, whether or not the weapon does damage has no corellation to that.

If the weapon has absolutely no effect then there should be no damage being done to the armour is all i am saying.

I suppose Ender could change the wording of it so it portrays more literally for you. Something like "the hit does 0 damage."

This of it this way; the armor took damage but the bot didn't. So the weapon didn't pierce the armor, but the armor still got scratched or something.

Think of it this way;**

Lore version: Even though the attacking robot's weapon does no damage, the defending robot still has to physically move and prepare to be hit because the robot's AI is not good enough to anticipate in advance that there will be no damage. This physical act of moving occasionally takes a small toll on the defender's armor.

Game version: Unless I misunderstand/miss my guess, it shouldn't be changed so that damageless dumpers can't be abused further in making dumpee maintenance even more trivial.

Nevermind, I did misunderstand apparently. Defenders don't take permanent damage, so I'm sticking with the lore version for now.