I don't think I get it. What exactly is the controversy, after you've established that weapon quality increases effective skill levels, for some applications (keeping in mind that the risk of sparring injuries seems inversely proportional to weapon skill)?
The risk of sparring injuries is inversely proportional to weapon skill, and thus also weapon quality, but the intensity of sparring injuries (damage) is directly proportional to weapon quality. So, the question is whether bigger, less frequent hits (due to high-quality weapons) is safer than smaller, more frequent hits (due to low-quality weapons).
So I'm just wondering whether or not the skl*5+5 modifier more than halves the number of real hits. If it less than halves that number, the doubled damage from a MW weapon over a no-quality weapon would make it less safe (since damage total would be *2/x, where x<2; total damage increases). If it exactly halves the number of real hits, it's really no safer (where damage is *2/2), whereas if the chance of real hits is reduced by more than half it would be safer (*2/x, where x>2; total damage decreases).
I'm not really sure how to explain it better than that
Part of the problem is that I'm not sure how to put it into mathematical formulas to show it more clearly, which makes describing math stuff hard. Basically, though, number of real hits isn't the only thing you have to worry about in sparring, which is why MW adamantine weapons are still comically unsafe.
Do strange mood dwarfs always become legendary upon creating an artifact? I've had 3 artifacts createn now but only 1 dwarf has become legendary.
There are several forms of mood, each of which gives different messages when it begins and when you scroll over the workshop. You, it would seem, have gotten the message "Urist McMoodydwarf has been possessed!" in big purple letters twice, which means that your dwarf has entered the type of mood known as Possession. Possessions do not give skill boosts, while every other type of mood does.
So... No, strange mood dwarves become legendary only if their mood is not a possession.