#1 It is a relatively short series
It is extremely difficult to deliver a whitewash to a side if it is a 4 or 5-match Test series. Even one of those games could end in a draw. For instance, Australia was 3-0 up after 3 Tests in the Ashes in 2017-18 and had it been a 3 Test series, then they would have delivered a whitewash.
However, the 4th Test at Melbourne turned out to be a damp squib since the pitch was a notoriously placid one and the batsmen made merry as the game ended in a draw. The pitch was later reported for being too batsman-friendly.
That is why the brevity of the 2018 New Zealand-England series is such a huge factor. The fact that the hosts are already looking good to take a 1-0 lead, it is not entirely inconceivable that they would put one across England in the 2nd Test as well before the visitors can get their bearings.
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