So would you recommend maintaining the flat left wrist all the way through to the finish? Isn't there a natural tendency for the left wrist to bend once the shaft is back on the plane after impact?
The hitting reflex can indeed be called "natural" since most people have a hard time avoiding it. What it does is ADDING with the right, causing the left wrist to bend.
In this case "nature" has to be fought. Nothing strange in that. We fight temptations every day. When nature calls...
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When James Durham recorded 94 at the Old Course at St Andrews in 1767, he set a course record that lasted 86 years. Golf: A curious sport whose object is to put a very small ball in a very small hole with implements ill desiged for the purpose - Sir Winston Churchill