The first reason

The first reason is that Legendary weapons typically have a very strong visual identity.

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Unlike other item types—like a ring or a belt, for example—you can see the weapon you're wielding, often very prominently. This is important because, in addition to discussing the mechanical design of Legendary items (its stats and powers),

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 we also want to talk about their visual design, and that's much easier to do when you've got something that's bigger and has a lot of visible components.