I think its because its forgotten by alot of people, including myself. Its great, but its not something you see like Ochain, and its harder to make than any other Emp excluding Ochain, so you don't see many around really.
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Kannagi because any other katana sucks for mainhand besides relic [except hochomasa but people apparently don't want you using a utility katana boo]
and even then, kanna-koku combo would probably be stupid amounts of fun.
You say it's harder than any of the others, but at least you start at the abyssea phase, so you skip out all the other NM and VNM phases which makes up for the time sink of the first 2 abyssea phases.
Funny thing about it is, lvl 90 version:
Cost: probably about 3~5 mil, buying sisyphus fragments. Not much point in buying the pops for first phase as you can farm them whilst waiting for VNMs for phase 2.
Usefulness over other instruments: +50%
lvl 99 version:
Cost: ~200 mil
Usefulness over lvl 90 version: +33% (and a little extra duration, though this only plays a part during SV really)
No other Empy is THIS MUCH better than anything else at either the level 90 stages, or the level 99 stages. But 200 mil... Mine might never reach 99.
Thats saying its faster because it skips the worthless trials, not so much that its easier. And in either case, I was just saying I forgot about it myself, and think others may have as well when posting, because unlike Ochain which is displayed on a players character, the Harp is only used when singing. Because of that, and the fact I have only seen 4 or 5 I can recall, so it doesn't stand out much and slipped my mind. Either way this is off topic, or what I am trying to say is.