Stack fallacy has caused many companies to attempt to capture new markets and fail spectacularly. When you see a database company thinking apps are easy, or a VM company thinking big data is easy — they are suffering from stack fallacy.
Stack fallacy is the mistaken belief that it is trivial to build the layer above yours.
Mathematicians often believe we can describe the entire natural world in mathematical terms. Hence, all of physics is just applied math. And so on and so forth.