I have to agree here. The author confuses what immutability is about by implicitly extending to control issues which are orthogonal to immutability. The author

I have to agree here. The author confuses what immutability is about by implicitly extending to control issues which are orthogonal to immutability. The author describes the problem very well but misuses the term "state" to describe "control". The solution to control issues is not having your code depend on order. Logic programming, SQL, schema, type declarations, regex... Many of us use these all the time but logic/declarative programming in general is not the norm in $dayJobLang.