[littlestymaar]

That's true that there's a balance between the safety benefit you get from the feature and the overhead it ads for the operators (the key example in nuclear reactor I was talking about has actually caused a issue once leading to the enforcement not an additional procedure around it).

What I meant in my response is that the answer cannot simply be “interlocking in a plane would be too dangerous”, so my original question still stands: why is it the case in airplanes when it looks so fucked up from a train perspective.