Lots of theories of everything these days. However, IMHO they all fail to address one fundamental point. And that is the issue of experiental consciousness, or, in other words, the fact that we experience that we are part of the universe.
Why is this fundamental to any theory of physics? One could argue that it can be addressed as something which is outside the universe, like an external observer watching in. But the important point is: this cannot be true, for I, and a lot of other people, are discussing experiential consciousness: it "loops" back on physics, so to speak. It interacts with it.
So, to me, it would seem that any "mechanic" theory of physics just can't be true, or rather, it can't be complete.
The only ways out of this, that I can think of, would be: 1. Experiential consciousness to be only an illusion. But then the question is: why is this illusion necessary? Why would physics plug the idea into my memory of consciousness? (possible answer: because in the worlds in which physics does not do this, I would not be conscious, but this is a circular argument). And thus this would go against Occam's razor. 2. There is choice is the universe (the universe is tree-like or DAG-like, and an observer could take a preferred route). Not really a satisfying explanation either, imho.