I asked similar question (not exactly, different examples) and also a few others to one person (face to face in a traning centre, 9 years back) who worked as Salhakar to PM for many years.
His answer was unsatisfactory. As it was a traning course where all participants were officers hence he unable to deny answering. But, avoided as much as he could.
Eventually, I summarise it as like.. "The main objectives of such categorisation to present ourselves privileged than others". Benefitting the group in which we are not personally part of is most likely a drama (dikhawa).
This is been there a long time. I had this when i faced for Govt and UPSC exams.
Problem is that, once someone makes use of all of this and gets a job, their kids still can keep using it. Its an easy clause to include but sadly isnt.
It genuienly helps folks but its also extremely easy to abuse.
Oor change for time being 🤭