In most cases that would indicate an organizational failure. However, if something is trillions of miles away, and wrong commands could break communication etc, I'd probably just stick with the most experienced person as well.

I think it's incredibly naive to assume there's not documentation. Maybe look into NASA and the Voyager 2 program a bit.

Experts aren't made from reading a data sheet or process doc. Competence in performing a critical task comes from actually doing the task in practice and for real.