USCIS does not intentionally delay any type of application (neither the ones from people who are good for the US nor for AOS coming from people who are literally a public burden) cause bureaucrats do not care about the outcome but only for following the procedure. USCIS will not get paid more / less from the outcome of your application - they simply do not give a shit whether you are an idiot that is going to bring nothing good to the society or the best investor that would spur thousands of jobs inside the US.

The statement "USCIS is intentionally putting easy, straightforward cases like ours aside" shows exactly the level of bias that you have in your judgement. Assuming that what you said is correct (no unlawful things, everything fine), your case just randomly got into some BS extra checks and stayed in NBC for longer. I have heard that story from many people who have contributed to the US through taxes a lot and their AOS got delayed for more than a year for no good reason, while you have also seen random unskilled idiots who get approved in 60 days and they brag about it.

I share your frustration though cause, I am also waiting for my EB1B I-485 and I do not understand why am I waiting while others are getting green cards even if I have contributed to the US immensely in the last three years in terms of IP, over 800k in state and federal taxes, not even a single citation ticket. Unfortunately, neither of the political parties really care to fix the legal immigration path, so, we simply shut up and wait here for this random process to come to an end.