By Craig Ellenport What will Ben Roethlisberger’s retirement mean for the Steelers’ fantasy weapons such as Diontae Johnson, Najee Harris and Pat Freiermuth? It’s the end of an era in Pittsburgh now that Ben Roethlisberger has officially announced his retirement. From a fantasy impact: How will that affect the Steelers’ skill position players? The easy answer is that it can’t hurt. While Roethlisberger ranks fifth on the NFL’s all-time list in passing yards and eighth in touchdown passes, his 2021 numbers were mediocre at best. He was middle of the pack in yards and touchdowns, and his fantasy…