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The short answer is that if you are paying more to kill a single threat card than that threat card actually cost to play you will often end up falling behind

While its less true than it used to be (thanks to FIRE design, cards designed for Best of 1, and increased modality/card draw in general), its still a key part of gameplay and it feels like what this mechanic, and in particular, gifting a card, was designed around

Trainer - There are multiple different types of trainer cards (items, stadiums, and supporters) that a competitor can use during a battle

These shops often create their own mystery boxes with a personal touch, sometimes including exclusive items or local favorites you wouldnt find in a mass-produced box

Im looking at you Krenko's Buzzcrusher)

With the right deck, Past in Flames can enable incredibly fast strategies that go off in early turns