> Even if you using language level guards instead of comments such as #pragmas or metaprogramming (if this_function_name == "JohnExperiment3"), people will just ignore the guards and Ctrl+C+Ctrl+V the "bad" source code lines they need. The infamous example of "if windowsos.version begins with "9" is copied all over the place.

Hmm, could this be the reason for windows 10 after 8?