Thematically, there being no overlap between the weapon skill and the Tenebrium skill can make some sort of sense when you realize that the skill is all about handling Tenebrium safely.
Imagine, if you will, a person who has both a water balloon filled with normal water and one filled with radioactive water. The person can be skilled with using the normal water balloon all he wants; flinging it, juggling it, etc etc, since there is no risk to his person. But the radioactive balloon requires more care, different techniques to handle properly without risking damage. A Water skill of 5 won't mean a thing if you're pulling your punches trying to use the radioactive balloon with 1 Tenebrium skill.
Conversely, the techniques used to handle the radioactive water balloon would have little effectiveness when handling normal water balloons.
The point I'm trying to get at is that the Tenebrium skill is like an exotic stance that all weapons have; it's not really compatible with how the weapons would be wielded normally if they weren't radioactive pieces of Rot.
I'd agree with that if Tenebrium weapons didn't came in different flavours.
Using your analogy, let's say we also have water guns in our water weapon arsenal. I think we can agree the way you use water balloons vastly differ than the way you use water guns. Now you add radioactive water. While it's true we need new techniques to handle radioactive water, you still don't handle radioactive balloons the same way you would use radioactive water guns.
But anyways I just wanted to point out the weirdness in how weapons proficiencies are applied, but is everyone else happy with this then?
