Board Thread:Manga Discussion/@comment-39718735-20200516000645/@comment-46650764-20200902214734

To be honest, I just believe that the beetle designed arrow was designed differently to point out that this arrow was the driving force for the plot (and for part 6, perhaps it's just the design of the arrows Araki decided to keep, kinda like DIO's The World in his recent artwork looks just like Diego's THE WORLD; it's a style choice).

It's like stand users and their fashion. Normally people in the JoJo universe who aren't stand users are bland and they kinda just blend in, but for the stand users, I think Araki stylistically made them more extravagant/different so people could figure who is important to the plot before the arc the stand user might appear in.

For an in-universe explanation, I'd say it was due to the creator of the arrows striving for perfection. It's said he wanted to wield "the power of god" and so he fashioned the arrows from the meteor that fell millennia ago, so there's a solid chance that he made arrows step by step (it's not like he'd make them all at once, that'd be a hassle), each one perhaps getting better than the previous, until he reached his vision of perfection (just like an artist who strives to make each piece better than their previous work).

Though this is just my viewpoint, but I think it's pretty solid.