Commanders like Nalia de'Arnise and Burakos, Party Leader are designed with this mechanic in mind
Something important to note as well is that it's a retro environment, and thus a closed format
Arsenal Summoner X WIND Level 4 [ Spellcaster / FlipEffect ] ATK 1600 DEF 1600 FLIP: Add 1 "Guardian" card from your Deck to your hand, except "Celtic Guardian", "Winged Dragon, Guardian of the Fortress #1", "Winged Dragon, Guardian of the Fortress #2", "Guardian of the Labyrinth", or "The Reliable Guardian"
Beyond just making sense, changing this ruling wouldnt affect anything, outside of Vanille and Fang
Fear not, she is not nearly as deadly as the rumors make her out to be
You have to be pretty scared of creatures to want to run this so either you know you are facing some hate or your deck is weak and slow and you expect to still be playing the game on turn six