This property prevents certain class of cracks, making it harder to pirate software.

Consider the following example: a vendor provides a free demo and a paid version of the same program. Functionality is the same (`computes the same function'), the paid full version uses a good O(log(m) + log(n)) algorithm while the free demo is purposefully encumbered with a bad O(m * n) algorithm -- in hopes of making you pay for heavy use of the program.

Now the property means you can't really trace which exactly part of the program encodes the key algorithm, thus you can't really patch the demo version to the full version.