This is an absurd change that will have catastrophic consequences in both academia and the private sector. Even if you're a US citizen who is "America First", you will feel the impact, and it will be net negative.
You don't know what you're talking about. This is the very last stage of the GC process. Before everyone had the choice to do AOS or CP. I personally chose CP. Now there's only the choice of CP. But nothing else has changed. It means you need to fly back to your home country for a few days for the interview and then you get your GC on the spot.
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I doubt it. We've seen time and time again that what the USCIS considers "extraordinary" are actually very, very ordinary circumstances. Anybody with proof of employment will qualify.