[Avodah] S"A 167:4 - ten fingers on your challah

[Sholom Simon]

The Mechaber, at 167:4, notes that when we say hamotzie, we should be
holding the challah with 10 fingers, and he then proceeds to give six
different reasons.  (I'll add the the Tur also gives a number of reasons).

This seems kind of rare for the S"A to do that.  Does anybody know why he
does so here?
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