Try to Explain Weapon Strenghs/Weaknesses Options

[Yourself]

Inspired by this thread.
Here is a screenshot of the weapon relationships (I don't think this is a spoiler):
So try to explain the relationships. I will start:
Bows are strong against staffs because magic users do not wear armor. They are weak against weapon users because they do wear armor. (Yes, I know there are a number of problems with this theory. Feel free to point them out but please provide your own theory as well.)

Also the fork, knife, spoon er.... I mean.... the rock, paper, scissors umm... that's not it.... the sword, spear, axe relationship is the same as in Fire Emblem games, so your explanations will work for that game as well.