Retrogression on visas for foreign nurses

While many nurses who took all the steps of the immigration process are still waiting in line for their visas, nothing is changing regarding the retrogression

the retrogression is still active and there has not been any changes since years now

which means now, that after going through a very difficult challenge and process to achieve a program and pass all the tests ( that cost a lot of money for foreign nurses who are known worliwide to work hard but are underpayed ) , the National Visa Center is not delivering any visa

And the foreign nurses are not notified, they can only be notified by the attorneys at law who themselves dont know much about what is going on at the National Visa Center either

So everybody is waiting, no one understands anymore what is going on

Nurses are waiting abroad and tired after a long time going through different exams, and paying a lot of money , Hospitals in the US are waiting because they need nurses , they dont have any possibility to recruit inside the US because of nurses shortages , and patients in the US need care too.

Why does the National Visa Center block the process at the beginning , and spare time and money to foreign nurses since they know they dont deliver visas

Why should they be silent, as well as the whole system, who is taking advantage of those nurses , because in every step that has to be taken ( and i am going to publish later the costs of every step) its a lot of money thatis being asked and required

So why should the nurses work hard on their immigration plan, follow everything by the rule and still obtain nothing in result?

Why are they being blocked and targetted this way, when they follow seriously and legaly every required step

The nurses who are waiting abroad are treated very unfairly .
So some of them have been waiting for more than 4 years to have a visa once they were approved, because it seems that when their case is transfered to the National Visa Center , it stays there for ever.

LEt me know what you think about this too