There have been several advocates of using the rules "as is" and I I finding their rationale to be very persuasive.
I think the key (as mentioned earlier) is the DM modifier of the task. The -3 (for untrained) reflects that standard full functioning in real time is unlikely to yield success. Therefore the idea of generalizing the skill Spaceship Operations is not realistic. As an example, the computer system could aid a non-engineer to preform an emergency shutdown on a power system. However, I think an untrained person has only a remote chance of starting up a power system in any complicated situation.
So the ultimate issue is the DM assigned for the situation.
I think the key (as mentioned earlier) is the DM modifier of the task. The -3 (for untrained) reflects that standard full functioning in real time is unlikely to yield success. Therefore the idea of generalizing the skill Spaceship Operations is not realistic. As an example, the computer system could aid a non-engineer to preform an emergency shutdown on a power system. However, I think an untrained person has only a remote chance of starting up a power system in any complicated situation.
So the ultimate issue is the DM assigned for the situation.