So you're saying the amulets logically could NOT have been used to channel their power, maybe augment it, and maybe pass down the artifacts? Or the fact that during that time period everybody used certain artifacts to channel their force abilites? You're just going to diminish their abilities by saying "They needed this otherwise they wouldn't have use it". That could be a logical assumption but so could mine. Now let me ask you something, if they DIDNT have any of these objects or tools, how would anything get passed out over the millennia? How would Kun have been in power, how would Revan, Malak, Bane, Nadd? We could argue the validity of their weapons all day. And I WILL argue that Sadow clenched his fist without touching anything, and the star blew up, that scan is clear as day in the beginning of DLOTS, so I think I'm safe with that one
Also, where does it say that Palpatine was a master of sith alchemy? Maybe he was, but the ancient sith were actually CALLED masters of Sith alchemist, especially Sadow who learned from the best alchemist in Simus..