I believe Ashkenasi Jewry took very seriously the perspective that saying the Karbanot was tantamount to offering them. For this reason the Eyn Kelokeinu followed by P'tum Haketoras was not said during the week since at that time people are rushed and would say it innaccurately. It is well known that the spices improperly prepared would create a Chiyuv Mitah. Since verbally formulating the spices is conceptually equivalent to preparing them, a mistake in the verbalization would be theoretically very serious. Therefore, only on Shabbat and holidays is Eyn Kelokeinu and P'tum Haketorat recited, for at that time we are not in a rush to complete the dovening and can be careful in our formulation. This may also be the source for not saying all the Karbanot daily, or even on Shabbat abd holidays. In my shul we say all Karbanot only at the beginning of Shacharit on Yom Kippur when we are in no rush whatsoever. In so doing we are avoiding the serious issue of verbally formulating the Korbanot incorrectly which would be against tradition. I am sure that matters of convenience and trime constraint has also played a role in the lack of Karbanot recitation. However, I believe I am following my Rebbi's, the Rav's, dictate in finding a Halachically tenable reason for this custom. <br>
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Kol Tov<br>
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