Also, the Dead once served Sauron himself. That was the reason that Isildur cursed them in the first place. Even though Aragorn has great strength of will, and can even be said to be a match for Sauron (he did wrest back the Palantir of Orthanc), would he be able to ensure the loyalty of the army of the Dead? Shades, fear, wraiths, and etc. are under Sauron's dominion, and the Big S. definitely has more experience than Aragorn in commanding armies, ensuring their loyalty (even through fear), etc. I'm not sure that the Dead would stay beside Aragorn if they were confronted with Sauron's forces.
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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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