I think there is one small tiny teenie weenie important factor playing in here.

There have been so many fantasy games in the decades of video gaming that's it's very difficult to make clothes and weapons featured in them look unique.

Artists are going to have to branch out to more unusual designs in order to keep the appearance fresh instead of looking like a copy of something else.

That being said, the Ifrit weaponry looks quite unique, so I think they did a good job on them.