The voters have an 85% say in it. The superdelegates are the other 15%. If a candidate wins over voters by a wide enough margin, which they usually do, then in fact, the superdelegates have no say in it.
The electoral college is not a "fix" either. It's a structural problem in our system that dates back 200 years and which was not originally intended to produce an electoral advantage to one political party in the 21st century. Still not a "fix."
One key difference between the two, however, is that primaries are run by political parties, which are not governmental organizations. These parties can make their own rules. They don't have to even give the voters 85% of the say. There hasn't always even been primary voting.
Another thing which is getting tiresome is that I know even if Bernie loses the popular vote and the bulk of ordinary delegates his supporters are still going to say it's a fix. Because it's exactly what they did in 2016. It's one thing that Trumpers, Bernie Bros and Paulbots have in common. If their candidate loses, it's always a fix.