IMO SA work with right players and on the proper positions, all my team has SA and I try to explore that a lot shadow striker always score from long range, free kick taker usually scores, corner kick works well and on defense only aerial and defense wall, some people do put others SA for defenders but I think it's a waste and for me even dmc should only defend, the only ones I don't like much is dribler, and playmaker I think they don't work att all.