Why do I complain about DBs?

This is not my point.
21% LUK is enough to get you somewhere. If you're going to train at LHC, you will always have MW, and you will always be potted.

My Dual Blader with Final Cut does the same damage as my Shadower without attack pots.

well, someone else can say all clean equips is enough to get you somewhere, it could be the case that just 120 can be considered enough to get you somewhere.