Just… what? Do you have some kind of baffling misunderstanding of what was going on here? It's perfectly possible to build systems such that they can be tested

Just… what? Do you have some kind of baffling misunderstanding of what was going on here? It's perfectly possible to build systems such that they can be tested 'in production'. Indeed, in many cases I'd argue it's far more useful to informing the result of tests. I completely reject the notion that 'health and safety' and 'box ticking' is responsible for the disaster at Chernobyl, when it's quite clearly the opposite: a lack of rigorous safety procedures, and those procedures which do existing not being followed.