It isn't the same. With immutable properties the constructor can change the value of Y based on its own decision logic. So 5 is just a default and the constru

It isn't the same. With immutable properties the constructor can change the value of Y based on its own decision logic. So 5 is just a default and the constructor may change it. That allows for multiple constructors, some that set the value some that don't. If the value is always going to be 5, then use a const.