We cannot think of the phrase, "get the job done," as being anywhere close to analogous to, "it doesn't matter what equipment you use." Think of it this way: a person who wears a 42 regular suit, who needs to be at a function requiring a jacket, can "get the job done" with a 44 long. But he will be fidgeting, raising the sleeves, tugging his tie, and not comfortable, although he will be "dressed appropriately" for the function. OTOH, he will look great and feel comfortable in the 42 regular, and have an overall better experience at the function. Same way with a mouthpiece - get and keep the one that tailors properly to the player's embouchure, style and repertoire.