The reason is simple, if you dont deal with something like Kessing Flamebreather immediately, and most of these cards have 3 toughness, you can easily lose in two turns
This effect is permanent and cannot be undone, save by restore control effects, bouncing to hand, or flickering
Doomsday Doomsday results in somebody dying shortly after its cast
Compared to other extra-turn sorceries like Time Warp and Alrund's Epiphany, Temporal Mastery's miracle cost can provide you with an early game advantage at a converted mana cost of just two mana
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Soldevi Machinist and Vedalken Engineer are 1/1 creatures, but Renowned Weaponsmith comes in at a 1/3