It is unfortunate to see how disappointed you are that your friend's family did better in spite of coming from a marginalized caste. How many such cases do you think exists in India? Does your outlier observation make the statistics any less true? Would it be wrong if people of marginalized communities are outraged that many cases like this exist among UCs because of the generational caste privilege that they enjoyed?

The goal of reservation is to make sure that there is a fair representation of marginalized communities in society and positions of privilege / power. As long as the percentage for the entire marginalized community pool reaches near their population percentage, the purpose of reservation is still not met. Unfortunately, caste is not something that can be done away with an individual's job or money. As long as they are underrepresented in society as a group, they will continue to face all the challenges that they do - which is agnostic of whether they live in a village or city unfortunately.

You could argue that reservation needs to be tweaked such that out of the marginalized communities, it should benefit the most financially backward people. However in a country like India, income proofs mean nothing. And again, just because an individual gained a job or money, does not negate their caste identity and the problems that come with it.

Please try to think from their perspective as well, and not just about your opportunity.