If you haven't seen the technical difficulties that crossrail has run in to then you haven't been paying attention. They've been talking for years about how complex it has been to integrate the 3 signalling systems in use at various points on the line, so I'm not surprised they want a human in the loop in case one of them gets a bit wonky.
It would be good to avoid these snippy comments. Obviously no one can pay attention to everything - we don't have much additional capacity over family and work commitments, so phrasing things as though people are to blame for not knowing enough about a London construction project is worse than unnecessary.
But given that premise, should we not first do away with snippy comments like "why don't they just [..], it's not that difficult"?