It is repeated over and over that the theory of everything requires complicated mathematics. This belief is so common and so deep that it is rarely challenged.
Why do people believe this? Is there the hidden idea that the world is complicated and difficult to understand? In the past centuries, physics has shown the opposite: time after time it was discovered that the world is simple. So the evidence points in another direction.
The belief that the theory of everything is complicated to understand is yet another type of ideology, contrary to all evidence known so far.