I have seen Fortran programs that don't have any subroutine at all //senior guru model. Even if you could reason about that large amount (40K LOC) I don't enjoy

I have seen Fortran programs that don't have any subroutine at all //senior guru model. Even if you could reason about that large amount (40K LOC) I don't enjoy when you die and I get the responsibility to fix "the bug". I do agree that you should not (depending on language) write sub of everything. ex int add(int a, int b) {return a+b;} //Junior model