I enjoy having a theory that covers everything, at least at a broad 50,000ft view, and one which also makes some sense right down to the microcosms that we live with. It is efficient to have a unifying theory, but it also makes sense. Having already studied Spiral Dynamics which for me makes sense of all the different theories of human behaviour, T.O.E. provides a wider view. Ken Wilber explains in a lot of detail how the All Quadrants, All Levels and eventually All Lines works as a model and it makes a lot of sense. He also describes many of the institutions, cultural movements and other things and shows how they have a vMeme view, rather than AQAL.
Ken Wilber’s book, A Theory of Everything will either give you the answers to how systems and concepts integrate, or it will give you more questions than what you started with. Either way, you will be better for it.