Long time ago was hands the mean to express numbers - hence became 10 the natural radix for the number system we use today. We could decide to use other numbers as radix but will usually avoid this.

Computer based at digital electronic give no choice - a binary system must be based at 0 / 1 hence radix = 2.

Binary numbers actually quite effective - with only four fingers at one hand is your able to count to 15 versus 5 (with five fingers)