Base 10 is arbitrary in the sense that it is "based on or determined by individual preference or convenience rather than by necessity or the intrinsic nature of something."
However, if you bother thinking about the word arbitrary too hard (as your comment inspired me to do), you end up in the realm of existentialism and down the proverbial rabbit hole.
However, if you bother thinking about the word arbitrary too hard (as your comment inspired me to do), you end up in the realm of existentialism and down the proverbial rabbit hole.