The number system notation we use today is a much cleaner scheme than what was used in the past. Some early number systems had no notion of negative numbers, zero or fractions. Our decimal based system combines these ideas together into a concise operational system that allows us to do math with less effort. Imagine trying to do what we do now with Roman numerals or Egyptian fractional math.
The number base chosen determines how much one has to memorize for addition or multiplication. If you consider binary numbers the tables (2x2) are quite small versus base 10 (10x10)or consider base 60 (60x60) and how big the tables would be. I suppose we could have used base 12 as it has more factors (2,3,4,6) than 10 (2,5) but convention chose the decimal system.
This process repeats itself in abstract math notation as well where Newton’s Calculus notation was superseded by Liebnitz notation which is arguably cleaner and more flexible. Math notation is a tool that make it easier to do the math and that desire drives us to discard some notation and choose others.