Your question seems along the lines of "if beaks are so successful, why don't all species have beaks?" All animals are the way they are because of a combinatio

Your question seems along the lines of "if beaks are so successful, why don't all species have beaks?" All animals are the way they are because of a combination of random mutation and environmental pressure. If a trait is successful in one species, it doesn't mean it will occur in another species. If it does occur in another species, it won't necessarily be reproductively beneficial depending on environment and other factors specific to the speices, so may not ever become a generalized part of the species.