Why when riot change healthbars didnt leave option for back old ones?

Why when riot decide to change how healthbars look, they didnt leave us option to back old ones. I think its a litle bit egoistic from them to leave new healthbars when no one like it. Profesor Akali, Double tear ryze, Brofesco and tons of players didnt like them and hope not come live. Then why riot realease them on first place?
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