1. Motivations

Mechari want nothing more than to ensure the eternal survival of the Dominion. Many Mechari also hope to one day be reunited with their Eldan creators. It is uncertain if these desires are hard-wired into the Mechari, or if they can somehow be broken. Regardless, there has never been a single instance of a Mechari betraying either the Eldan or the Dominion.

Source: Loremageddon