I see no problem in judges having a "game plan" for each competitor as it would help them to know what to look for during the skater's performance. But I still don't think they should attend practice sessions. As an earlier poster stated--some, if not most, of the competitors don't do full run-throughs--just do isolated moves. So a judge, viewing that competitor at a practice session, might see him/her doing a move that they have practiced over and over and have become proficient doing. The judge would only be getting half the picture and might be more lenient with marks.