Well, the cliche apparently tries to cover all the code, which, as you correctly said, is non-practical. The problem is that, like all other cliches, it sounds

Well, the cliche apparently tries to cover all the code, which, as you correctly said, is non-practical. The problem is that, like all other cliches, it sounds very convincing and it may take quite some time for the young inexperienced mind to rebuff it.