Because Stack Overflow is for asking a specific question that can generate a specific solution or answer. This is spelled out in "The tour" and the Help Center

Because Stack Overflow is for asking a specific question that can generate a specific solution or answer. This is spelled out in "The tour" and the Help Center which no one ever reads. Then they complain when their question gets closed as if they were never told--even those who are told, don't read the link they're given to the above topics, and continue to complain anyway.