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Yep. I like the analogy one of my first University lecturers used... "That small change you've just requested is the equivalent of asking a construction crew to 'just add a few more storeys' to their skyscraper months from completion. All of a sudden your elevators don't go to the top any more, we suddenly need an extra storey of underground parking, all the footings aren't deep enough to keep the building steady in the wind..."