Which check or balance do you think is being ignored here? The point of the executive branch is to be the one where unelected and loosely vetted administrators work.

Congress is mostly voted officials, the judiciary is the group that are carefully vetted for cultural fit and the executive is where the messy parts happen with oversight from the other two government branches. It is where people like Musk are supposed to be working - the president thinks he a good person to be wielding power.