You would need some kind of standard to scale them to, so you would need some 'core topics'.
(Which is basically what we already have in place, except I think you are basically advocating for more elective topics)
Biggest problem I see with having more electives is that the more you have = more combinations, which means its much harder to teach
Right now we have electives, and technically you are free to choose whichever ones, but the school/teacher will generally only teach one.
Basically, it would be very hard to teach if every student has a different combo of electives