Most of the time, these UR Limited decks rely on a beater that counts instants and sorceries in the graveyard to beat face. With flashback, you're actively depleting your graveyard, so it's a bit anti-synergistic. These Elementals takes inspiration from Crackling Drake and friends to also count the relevant spells in exile, plus they have trample to get through pesky blockers.
How i feel about competitive players and casual players in EDH: The competitive are german tourists, the casual are italian tourists, both in a italian beach. The italians asking themselves "why are the germans here?" make a legitimate question, the answer is because the beach is beautiful, no matter the country you came from. The italians wanting to ban the germans are dumb, because if the germans pay for their stay and follow the rules like everyone else, they have the right to be in the beach. Hovewer, if the germans started to ask themselves "why are the italians here?"... they would be dumb as hell.