I believe the pendulum swings in accordance to society's weariness of a particular style of painting that has overstayed its welcome and it then becomes the appreciation of an art style that differs from the style at the time. Eventually, every style becomes 'passe', but realism or high realism, will always come in and out of fashion due to its aesthetic and technical appeal as well as the indelible truth found in most works of art. I personally prefer a 'tight finish', but as Michelle mentioned, the client is always impressed with high realism, and who can argue with a paying client? If you are talking about art critics, well, that's a whole other topic.
David
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