Why do all legendary weapons require a grindy and unbuyable gift of battle, but you can buy the necessary pvp components for them?

Seriously, why? Is there anything other than "how else would people play wvw?" as reason for it?

You dislike pvp? There's an armor set, backpack, and trinkets available for you. Dislike pve? Same thing.

But why are weapons the single exception, where you HAVE to play wvw?