If you submit a report on bugreport.apple.com, it will be triaged and (if necessary) passed on to the appropriate team to asses. I fixed several external user reported bugs when I worked at apple. You have to have a developer account to use bugreport. Now that I have retired, I use it. The people triaging do not know I used to be at apple. Not all the issues I report get resolved, just because they are probably low priority. But the important ones are dealt with, usually quite quickly.