Honestly, it helps that the gacha for those limited hime is open for a month as well (til Sep 20th)
That said, I'll take a few cracks at it if I don't pull some SSR with A frame debuffs, cause that's what the SSR does (along with water elemental atk buffing)
Honestly, a lot of the advent weapons now are dual skill...
So imagine dual skill weapons getting FLB... that makes them the rare TRI skill weapons.
There's a slight few dual weapons that do get FLB, but I think they're all gacha ones (hime release SSR if I'm right)