Here's where I have a chance to be presumptuous. I have this hypothesis that the reason that we cannot find a single formula that explains the Theory of Everything is because of the difficult interrelationship of the quantum mechanics of sub-atomic particles as they form mega-matter. The latter is rather orderly, but certainly not the former. However, since it's the subatomic particles that form mega-matter, it all "works out in the wash". OK, let me try and explain my insanity here.
If you've ever delved into photography, you'll realize that there's always some "grain", the size of which varies depending on the type of film you were using, in each picture. Picture each grain as a sub-atomic particle, which makes no sense to us visually when viewed alone, but which makes a lot more sense when one stands back to look at the entire picture. However, some of my photographs still made no sense, but that's just me.
So, what I'm trying to say is that the random nature of q.m. may be balanced out when we look at the "bigger picture" of mega-matter.