If you want to maintain mutual intelligibility of a nation you need a standardised set of rules to teach kids at school. If you just let it "develop organicall

If you want to maintain mutual intelligibility of a nation you need a standardised set of rules to teach kids at school. If you just let it "develop organically" without any governing body you get a wide range of dialects that will drift further apart from another and it will be very difficult to read any text that is 50 years old.