Of course, at the core of philosophizing is this insatiable desire to know the truth. This is still a very important purpose of philosophy. However, we can get so caught up with this game that we forget a more fundamental reason why we want to know what is true—to live our own definition of a good life.
The idea is that by being sharp in knowing what is true via metaphysics and epistemology, we can understand better the terrain of life and ourselves, which in turn helps us take better actions (see practice is the ultimate test of knowledge).
For example, although, buddha avoided metaphysics because, according to him, it prevents us from being kind to each other (because we agree about what we want and disagree about metaphysics and epistemology), amoralism demonstrates that metaphysics and epistemology can help us be kinder. So, if our definition of a good life is a kind life, to see things as they really are through metaphysics and epistemology can help us get there.