There are times when a shorter bow is a huge advantage. Generally speaking, a 64" bow will be easier for most people to shoot well than a similar 56" bow. I have both. For shooting from a standing position in open areas, I would prefer a 64" bow. From most tree stands and ground blinds, a shorter bow is much more convenient. My Morrison Mini-14 riser with "C" length longbow limbs results in a 56" bow. I also have Shrew Classic Hunters in both 54" and 56". All of those shorter longbows shoot extremely well at my 29.5" draw length. Try a shorter bow and see what you think, but make sure it is a bow designed to be short and still draw smoothly to your draw length. I expect you will like it. That said, 64" bows have been used for everything for decades, and have done everything well.
Allan