Fëanor is thought to have made the palantíri, or at least similar far-seeing crystals. Why didn't his sons make use of them in the War of the Jewels? They would be able to espy the orc raids leaving Angbad northwards to circumvent the blockade, and would have huge advantage when the armies of Fingon and Maedhros had to cooperate in the Nirnaeth. (In fact, the lack of fast communication had fatal results.)
Is there any explanation for the absence of these useful artifacts, besides "They forgot to bring them to Middle-earth"?