AAQ, of course you are right, and I do know the halacha, having seen Reb Moshe at the wedding. There is no greater indication of halacha than ma’aseh rav.
However, the Chofetz Chaim writes in his introduction to the Mishneh Berurah, that, in addition to knowing the halacha, one should try to know the reason behind it. And that is what I said I do not know.
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