If reality is understandable at all, then it is easy to understand - understandable by anybody who can understand anything.
What we can be sure about is that reality is NOT going to be too difficult to understand by children and simple people, yet possible to understand by intelligent and educated people.
How likely is that? That the difficulty-level of understanding the world just happens to be at a level that it is understandable, but only by a small minority of the ablest people; or that reality is understandable, but only to the minority of people who happen to have studied the right subjects!
That understanding is at a threshold located precisely in-between childhood and adulthood, and between the ability of some adults but not others!
(This is why esoteric and gnostic and abstract and complex explanations must either be wrong. or unnecessary.)
No, if reality is understandable, this is not a matter of luck or statistical probability but simply because God has made reality and God has made us - such that reality is understandable; and that must mean reality is easy to understand - that it is understandable by immature, the unintelligent, the uneducated.
(i.e. Reality is understandable by anyone capable of understanding anything-at-all.)
Reality is difficult to do, perhaps and probably; but easy to understand: if you allow yourself to understand it.