I was thinking of an old line of thought. That Occam's razor is often understood to mean that the simplest explaination is the one that you should favour; and is probably true.
I see here an interesting relationship between this line of thought, and the notion of the thought-terminating cliche.
"It is what it is" is the most simple statement possible, and it can be said with absolute certainty at any time. But when you say it, you signal you are closing yourself to more complexity.