Planes work just fine with 50% of their engine offline. Or with a missing exit door, or with 50% of pilots missing. An airbus will fly with 4 of its 5 control c

Planes work just fine with 50% of their engine offline. Or with a missing exit door, or with 50% of pilots missing. An airbus will fly with 4 of its 5 control computers offline If it was "just enough" to complete the mission anything going wrong would become a major issue