Original point was certainly to point out the most common mistake of typical homegrown cryptosystems. Even programmers who know that XORing stuff with constant

Original point was certainly to point out the most common mistake of typical homegrown cryptosystems. Even programmers who know that XORing stuff with constant byte is not viable encryption can produce systems that do essentially the same thing (usually by XORing everything with RC4 output with long lived or even constant key)