Real paladins in honour-based societies had a pretty good grip on its limitations:
“Take off your armour, Marshal: why are you armed?”
“I prefer it this way, if you please, sire. My armour doesn’t bother me. I shan’t disarm till I know what we’ve got to deal with! An unarmed man won’t last in a serious clash or crisis, and we’ve no idea what the French are going to do.”
The History of William Marshal
The Marshal behaves like an average D&D PC.