First of all, nice name, @Darth_Obama
Secondly, Hi! Welcome to the Shard!
Thirdly, a Shardplate is speculated to be made of solidified Investiture, that's too Invested to be Awakened, Investiture resists other Investiture. Plus, Law of BioChromatic Parallelism means Awakening something that doesn't resemble life in shape/form would be harder to Awaken