It is because of convention. It was necessary for some order of operation to be agreed so that wo people carrying out the same calculation would come to the same answer.
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the order of operations is as follows Parentheses exponents Multiplication and division addition and subraction
Working the exponents or roots is first in the order of operations.You do those even before multiplication or division.
parentheses, exponents, multiplication, division, addition, and subtraction.
Parentheses Exponents and Roots Division and Multiplication Addition and Subtraction
The order of operations is: P (parentheses) E (Exponents) M (Multiply) D (Divide) A (Add) S (Subtract)