this story resonated a lot with me. Have been in States for a decade and still waiting on GC.
However, throttling(7% quota) based on country of birth appears to be a bad proxy for diversity as India is a very diverse nation with rich cultural and linguistic distinctions. Designing a new immigration system would be a reduction problem from the existing one but we have seen successful implementations in other countries such as Canada and EU (albeit with their own set of problems)
I had reported this to FB security last year when I found it was trivial to find partially masked email ids & phone numbers of anyone behind my Uni's gateway.
I was informed that this was a design decision since previously used IPs are more trustworthy than any new IP. I considered this a design flaw and reported since large institutions are typically behind a NAT and they become susceptible to targeted attacks.
Normally obvious dups are detected by the system, but many are not. You can search before submitting, but most people don't bother. People will pick it up and cross-reference earlier discussions if appropriate.
i hope this will curb people from constant backstabbing that I witnessed during my short duration there. It was painful to watch very smart, bright people indulge in really pathetic behavior consciously to 'protect' themselves..
Edit: another that I enjoyed working with 'Burst Tries': https://dl.acm.org/doi/10.1145/506309.506312