Is it worth doing the book grinding for Zenith weapon at Level 80 WAR?

[MistakeNot]

Like it says in the title, I'm wondering if I'm pissing in the wind when it comes to spending the gratuitous amount of time it takes to finish the Zenith weapon stuff, namely the Zodiac Braves tomes, when I'm Level 81 and it's somewhat less powerful than my prior weapon at the level I'm at. If anything, I mostly want this damn quest out of my Journal, but is there an advantage to finishing all of this (still need to finish the other 7 out of 9 books)?

At that point the only reasons for finishing the level 50 relic quest are
Using finished weapon for glamour
A sense of accomplishment
Strong completionist tendencies
10 seconds worth of bragging rights


But no, it does not have any practical use at the point you are at.