Sure those programmers learn the rules... then they promptly forget them because they seem too complicated and "it works on my machine with only one client"..

Sure those programmers learn the rules... then they promptly forget them because they seem too complicated and "it works on my machine with only one client".. I agree with you, one must know why rules are important.. but in large systems, it's better if the system/language enforces this separation of data (praise Erlang).