Second sentence. Great point.
First sentence. Um, Really not sure Larping is the best source of knowledge. When I was a teen I would go out in the woods with others of like mind (read "bent mind") and using dull swords, axes and leather, homemade chainmail and improvised plate (good enough to handle a few chops of blades, but hardly pretty looking). even with that a few things were obvious.
Leather armor just made the bruises cover a bigger area. Padding helped a lot. Chainmail was almost useless. Plate seemed good, but tended to slip blade to an opening and thus, ouch and most importantly, the bladed weapons were essentially blunt, and if they were sharp, they would do a lot more damage. (One freind had some about half inch aluminum modified plate he always bragged up, I sharpened a wood spliting axe and had him make me up a small shield, then showed him how quickly the sheild would be shattered into shards with a sharp heavy weapon. (hitting the edge was quicker, which explains why sheilds of yore had reinforced edging.) I guess that was LARPing back then... but really just a bunch of guys beating the stuffing out of each other. Much like our games of tackle frisbee football, the game was not over until someone had to go to the hospital. (IN TFF whoever was ahead was the winner at that point, which lead to a lot of kamikazi moves by the leading team whenever they took the lead, he hehe)
I think you bring up an interesting point. Maybe it SHOULD be something like crafting. All blacksmithing works on your Blacksmithing skill, so helps in all other blacksmithing crafting, but also a component in the specialty. If you try to take a blow from a club with chain mail the same as if you were wearing plate, it would not be good, so not the same exactly.
But how would you implement that now?
Good second sentence though, and I am sure some have studied armor could answer it more realistically. but... for example... What about making steel? You do NOT EVER add coal to Iron ore tomake steel! I have talked to blacksmiths and several people at a steel mill (including the PHD who designed their process). Apparelntly you would get a mess. No, you make Iron stock, burning off all the carbon and slag you can, and then add carbon and other impurities (may be in ore to some degree) to make steel. In Japan they would start working an IRON stock into a blade and then heat, hammer and lay stock on rice straw, burning it and adding carbon to the stock, until it got easier to work enough to fold over and over and make the blade.
Also, in early metalworking, slag would be tossed back into the mix, over and over, to get the metal out of it, and then skimmed off the top and used to make roads, paths, or whtever. whatever iron is in the ore would still be in the slag. Note to mention, ever notice really good slag does not rust much, yet it is metallic? That is made of of metals whcih may (or may not) make for a better alloy, in moderation. I have found over 100 year old slag, and it is in much better shape than the horseshoe nails I find in the same strata. I wonder what it is made of exactly.....
So another incongruity. But hey, it is a game, close enough maybe?