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I would say, this is a matter of opinion. There was a rather extended discussion on that topic in 2007 in Personality and Individual Differences, which reflects the points of view of different SEM-experts (e.g. by Barret, Bentler and Goffin).
Personally, I try to consider a combination of both - these power estimations as well as rules of thumbs (e.g. N of at least 200 etc.).