Based on this the Shagas Aryeh suggests an answer to the Rishonim’s question. The reason why the Torah had to write a pasuk to exempt women from performing a bris on their sons is because it is not a mitzvas assei she’hazman gramma (it is a one-time action). The fact that it cannot be performed at night doesn’t make the mitzvah less; it only restricts the time that we have to perform the mitzvah.
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