One Theory Vs. Another Theory and Their Observations

Science is a community of observers, and their observations become theories. These theories don't always match up though, nor do they always encompass a wide range of observations. Sometimes theories like the theory of quantum mechanics are made, but they don't account for large particles of matter. The theory in itself explains particles smaller than 10^-9 m, but anything larger than that, characteristics and explanations cannot be devised. Then scientists created the String Theory which explains both large and small particles' characteristics. Both theories share the same observations for small particles, however, the string theory uses these observations in a different way, and includes large particles. Yet some scientists don't think the string theory is technically a theory, even though a theory is just an explanation for observations. Those scientists say that you can never really observe such small or large particles properly, and that you cannot ever test any of your ideas based on any observations. Therefore they classify the string theory as actually a philosophy of physics. A theory or a philosophy, the string theory fits observations and encompasses a wide range of observations as well, and supports the idea that even though one observation is used in one theory, doesn't mean that it cannot be used in a better way in another theory that encompasses more observations than the first.