They dont have the capacity / expertise to authenticate cards which is why they launched the authenticity guarantee service in the US in the first place
The focus on having exactly 11 cards in your hand is pretty thematic and interesting in a quirky kinda way
What Makes the Charizard Pokmon Card So Legendary

Return 4 Link Monsters from your Graveyard to the Extra Deck, and add 1 Jack Knights Paradion Astram from outside the Deck to the Extra Deck.Trader Exchange[3] Magic Exchange: Yeommu-ChungiReturn 1 Flame Dance continuous magic card from your hand to your deck, and add 1 Flame Dance - Heavenly Energy from your deck to your hand.During a duel using this skill, you cannot Normal Summon or Special Summon only Beast-Warrior type monsters (except for Special Summoning from the Extra Deck).This skill can only be used once per duel.Trader Exchange[4] Belz UnionSend 1 Bells monster from your hand or deck to the graveyard, and add 1 Bells monster from your deck to your hand.During a duel using this skill, you can only special summon Bells monsters (excluding special summons from the Extra Deck).This skill can only be used once per duel.Trader Exchange[5] Sacred UnionShow 1 Sacred monster in your hand to your opponent and send 2 Sacred monsters from your Deck to the Graveyard

Here are a few scenarios where opening might make more sense: You're Chasing Specific Cards : If youre trying to complete a set or looking for a specific high-value card, opening a box may be the best route
#8 Urabrask the Hidden When the Mirran resistance arrived, the furnace dwellers looked to Urabrask for guidance