The chance of winning the 3 lines reward of Wondrous Tails is ridiculously low

[Emstidor]

For the 3 line thing, the reward for the 5 slot materia gear is is very underwhelming for the rarity. For crafting and gathering, because how caps work, the difference between them and normal gear is almost nonexistent and that tiny af difference makes no impact for crafting rotations.

This is like saying rare crafting mats shouldn't be in Treasure Map chests because DoW/DoM players can't use them.

You're forgetting that these pieces are marketable, and I've never heard a noncrafter complain about scoring three lines because these pieces will sell for eight-figure sums quite regularly.

Edit: If that amount of gil is trivial or unexciting to you, then you're entitled to your opinion, but realize that you're in the minority on that viewpoint. Most players are still excited by high-value items for a reason.