If It Makes Sense For Shofar It Should Also Make Sense For Other Laws - Answer
The reason that we forbid one to blow the shofar on Rosh Hashana that falls out on shabbos is that we are concerned that he will carry the shofar in order to ask an expert how to blow. But no such concern exists with respect to reading the torah because the person reading for the congregation is already an expert so he won't have to ask. [Shofar is an obligation upon every individual.] In the same vein, one will not circumcise unless he is an expert so he will not have to ask someone else, hence no need to carry. [Tosphos Yom Tov]
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