It has to be somewhat arbitrary, because both the minor and major scales are common. Only 40% of popular music today is written in a major key. Maybe, yes, yo

It has to be somewhat arbitrary, because both the minor and major scales are common. Only 40% of popular music today is written in a major key. Maybe, yes, you still learn the C scale first, but you'll learn the A scale the next week. In the grand scheme of things if you are having problems remembering the names of notes then moving the keys over two steps is not going to make the necessary difference.