Well the problem with Carl from TWD was the point of his character being how developing in a zombie apocalypse made him not like a child. He was harder than a normal child; determined and almost ruthless. Even Neegan was impressed by him, and Rick sort of struggled with the fact that his son was not "normal".

I think the series got to that point, maybe? But they took super long to get there and then killed Carl off anyway, so that probably pissed fans off a lot.