I think that's (cat | grep) is one of those things left over from long ago and far slower machines. cat makes a copy of the file as it pipes it into grep, so that you have the /etc/passwd open for a shorter period of time.
Interesting. I guess cat gets most of the file buffered either in the pipe or in its read buffers, effectively acting as a read-ahead buffer from the days before the kernel and hardware did that for you.
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