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Northwest IR2s are for US citizens, not permanent residents. Different things. Meisje specifically said her parents were only citizens once she was 23. There was also mention that the only viable option to her was seeking out an employer sponsored visa, which is a whole other can of worms.
Let’s say you are in the U.S. with H-1B status and, while awaiting a USCIS decision on your I-485, which was pending less than 180 days based on an approved I-140 from Employer A, you start working for Employer B. Your new employer files a new employment-based I-140 application for you. What’s worse, you have reached the end of your H-1B six-year maximum, and no longer qualify to extend it while your new petition is pending. Your green card application will likely be denied. You cannot, after all, adjust status unless you are already in status. If you were to remain in the U.S. after your H-1B had expired, you would have “overstayed” your period of authorized stay and be in the U.S. illegally.
The same worker rights, eh? Do you have to provide work authorization forms which need updating every 240 days? 90 if your applications are delayed by the federal government, which is not uncommon? With the only guarantees if they lapse being put on indefinite unpaid leave and likely only if you can manage to secure a union job? Are you locked into a single job with no options to switch without putting your legal immigration status in jeopardy? Those don't sound like identical rights to me.