If a man walks in the woods for love of them half of each day he is in danger of being regarded as a loafer. But if he spends his days as a speculator shearing off those woods and making the earth bald before her time he is deemed an industrious and enterprising citizen.
Famous pivot stories are often failures but you don't need to fail before you pivot. All a pivot is is a change is strategy without a change in vision. Whenever entrepreneurs see a new way to achieve their vision - a way to be more successful - they have to remain nimble enough to take it.