This is an interesting point you hit on and something that is stressed in scuba diving. Basically whenever you go out on a dive you only want to change one thin

This is an interesting point you hit on and something that is stressed in scuba diving. Basically whenever you go out on a dive you only want to change one thing at a time. Only one thing can be "new" or "untested" or "new to you". Otherwise you run the risk of being task overloaded which leads to cascading failure - potentially catastrophic and/or nonrecoverable.