Rarity for Rarity (Let me know your thoughts!)

This is a pretty far-fetched idea, but what if there was somehow a system integrated within TCG Pocket that allows you to trade a specific card rarity for possibly another of the same rarity.
So for example, say I wanted to trade a Three-star Giratina ex for a Three-star Arceus ex. Well what this system would allow you to do is just simply exchange the Three-star for the other.
Again, pretty off par with how they integrated trading a while back. But I think it would be a pretty neat gimmick that would make players satisfied if they managed to pull duplicates.
Comments
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while yes, this would be nice, it would make any player-to-player trading completely obsolete and useless, and would trivialize completing expansions.
For reference, Sorted by duplicates, in my top 30 cards, i have somewhere around 310 🔸cards I could exchange. Id never need to pull a “new” 🔸card again. Any 🔸i pulled from then on would go back into the exchangeable pool. This applies to 🔸🔸 cards as well but to a bit of a lesser extent, in my top 30 duplicates i have somewhere around 105 duplicates. And while yeah 🔸 and 🔸🔸 cards are not the ones people care about, they make up most of the card dex, and trivializing half of what your game about is never a good idea0