All I'm saying is skill chains already do extra dmg and allowing magic burst, so how about allowing Lv4 to do more than just looking pretty with extra damage. At Lv95 and Lv99 we might see new weapon skills along with their own element for closing skill chains. If my idea becomes reality then those weapon skills should have a certain added effect upon closing a skill chain.
EX: Tenzen weapon skills:
Oisoya --> Amatsu: Tsukikage(closing with Amatsu: Tsukikage will allow aoe terrorize) = Cosmic Elucidation.
wishful thinking..