Most people are not in the job because they like create things or build things. They are there because they want a job and nothing more. And they want a job where (unit of money)/(unit of work) has a higher value.
That means they have to either figure out a way to make more money or do less work, or both.
Therefore the question of early interest or passion is meaningless to most people. So as far as they are concerned, it rarely matters how set of people of identity A got to it. They think regardless of that if set A got it, other sets should get it too.
This also creates other problems. Set A is likely to do side projects, write programs and hacks out of personal interest. Other sets looking at job as a return/effort metric will likely see why they are expected to do anything all all apart from working 5 hrs a day between 9 - 5.
The problem is merit is heavily at the side of A and other sets want the reward to not go with merit, but rather with participation itself.