Benefits of ufcs of D

original text
You don't ,

    struct MyData {
    
		int x;
		void method() {
    
			x++;
		}
	}

	MyData data;
	data.method();

It's written like this :

	struct MyData {
    
		int x;
	}

	void method(ref MyData mydata) {
    
		mydata.x++;
	}

	MyData data;
	data.method();