To be a guardian is much more than the armor, you need to be able to increase the hate others have for you to the level that you get the attention of the agressor, then you need to have the constitution to take the beating.
In other words, it is much the same as being a married man.
To follow a guards code forces you to step up and stand in the frontline, to prote...guard your objective with your life, and everyone is not cut out to do that.
If you run around in an armor without purpose you are a conqeror