This is a piece from R’ Yaakov Kaminetzky zt”l
???????? ?????? ?’, ????????? ?????? ???????, ????? ??? ??????? ??????. ??? ?????? ??????? ??? ?????:
What type of bracha is this? Is it a Birchas HaNehenin or a Birchas HaShevach?
There are many explanations given as to why we mention the midda of day by night and the midda of night by day (as we are doing with this bracha).
The Beis Yosef says that the reason we do so is remove the claim from the Apikorus who says that the one who created day was not the same entity who created night.
The Mahari Avohav gives a different reason. Were we not to mention the midda of night by day, one might think that darkness/night are bad. This is not the case, all is nice and proper for its time.
Accordingly, says R’ Yaakov, we can say that according to the explanation of the Beis Yosef that the bracha of ????? ??? ??????? ?????? is a Birchas HaShevach, we are praising Hashem for all which he has created, while according to the Mahari Avohav this bracha would be viewed as a Birchas HaNehenin, since we derive benefit from both day and night.