It was comfy. What can be better than having a show that you can watch in the summer and when summer is OVER for you, you cartoon bros have to deal with the same shit as you. That is relatable and creative.
Also "muh no new kids" isn't an argument. Charley Brown did the same shit. And worked. EEnE didn't need anymore people. By that logic, why didn't any new kids move into the hood? Or the other hood get finished?