Quite true. One of the reasons that Sauron probably used the Mouth at all was to remain distanced from his troops. You tend to fear what you do not see every day, and not seeing this Dark Lord at all, but hearing about him like that would probably inspire more fear than actually hearing him and speaking to him every day.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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