There are a number of myths in baseball, many of them to make the game more mystical and entertaining. Did Jim Edmonds have to dive on all those baseballs hit his direction, probably not, but it looked cool and sold tickets.
Growing up, it was always a big topic of conversation when a player changed position...oh, no, it will never work! He's a shortstop, no way he can play centerfield! But Robin Yount is in the HOF. I remember a lot of angst at all the moves that Pete Rose made...successfully. The myth is that players are best at one position and that moving them is dangerous, because, well, he's an expert at third base but knows nothing about left field! People forget that these guys, for the most part, have been playing other positions in practice, since Little League, in high school and college, etc. Joe Madden is the anti-Reb. He's moved Coughlan from left to right to second to first. Bryant has played all over. Maddon knows that somewhere, sometime, Herrera has played every position on the diamond. Everyone thought he was a genius for how he used Zobrist and others in Tampa. Actually, he just spit in the face of myth and tradition. It wasn't genius, it was distain. These are athletes; some are locked into a position because they excel at it or because of lefthandedness, but they can all move. Successfully.