That fluid look is associated with interlaced footage from live tv, sports, old soap operas etc, so apart from any extra visual clarity, there’s a psychological effect from experiencing a “movie” with this motion cadence.
Movies shot at 24fps on film or progressive-scan digital have a more dreamlike quality which helps the audience to suspend their disbelief. If you use a high frame rate, the audience may feel like something is ‘off’ and start looking closely at the set, makeup etc.
It’s not totally to do with motion blur, since a lot of movies have static shots where nothing in the background is moving and therefore has zero motion blur.
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