i just dont see it being an issue. zadarius smith got snaps as a rookie, judon got snaps as a rookie, kenneth dixon stepped in as a semi-starter in our 2 back system almost immediately when he got healthy. its not like harbaugh actually refuses to give rookies snaps, he may not give them a full starting role because often they shouldnt have one, and i agree that putting high value rookies on special teams is just stupid, but you cant dedicate 11 roster spots just to special teams.
i understand we seem to have trouble using wrs and tes right, but we give our young edge rushers snaps on the money downs. we cant even provide any proof that we dont use rookie edge rushers right because recently we havent had any young edge rushers, we've depended on suggs and dumervil since 2013 and when one of them goes down we've had: mclellan, upshaw, ZDS, and judon, of those 4 you can count 2 as rookies and they both got plenty of snaps. if we managed to get 6 sacks with zadarius smith as a rookie then i think thats concrete evidence that we use them right lol