@CWB @KarlosCV @Lieste, bringing you all in too.
From a logic perspective, yes, it makes no sense that Henry can’t blacksmith given his upbringing.
From a gameplay perspective, still doesn’t make sense but I understand it’d be hard to implement. I mean there would have to be different difficulties, then you’d have to do a minigame, let’s say once per day, so it’s made to seem you’re actually taking the time to correctly forge the arm/armour. After each minigame, Henry would leave the forge tired, sleepy, overall just affected of doing hard work all day.
From a story perspective, they could say because of the urgency of your quests, blacksmithing would be your least concern as you’re working to help end the Cuman invasion and your Lord would find you useless if you avoided your responsibilities he places upon you. He could even have men come from somewhere and tell you, ‘‘Our Lordship has sent me to say you’ve been given an order. There’s a dozen other blacksmiths around. Simply get one of them to forge your arms or else he’ll suspend you from his service.’’