What is the advantage of having this/self pointer mandatory explicit?

Question

What is the advantage of having this/self/me pointer mandatory explicit?

According to OOP theory a method is supposed to operate mainly (only?) on m

Answer 1

What if the arguments to a method have the same name as the member variables? Then you can use this.x = x for example. Where this.x is the member variable and x is the method argument. That's just one (trivial) example.