It's purely for glamour. As other have said, it's not exactly the same, it's actually only i180 and has a different "glow" effect.

I'd like to add that it's also not something that everyone is just picking up easily off of the ground. The recipe requires a drop from Ravana, so to obtain and crafts the parts yourself you would need to farm the fight. Even if you were to buy the weapon from the MB, it can be quite expensive....not everyone is willing to pay 3M+ for a variant of an existing weapon.

The only thing that makes your weapon obsolete is the fact that it's from old content.