Veera K7

I thought the exact something about why USCIS might be rejecting for U and T Visas

https://www.uscis.gov/I-918
 
That guidance is absent from https://www.uscis.gov/i-485
Let me speculate. According to https://www.uscis.gov/I-918 , this form is used for:
 
Often such people don't have their documents. They've been kidnapped, enslaved, trafficked, etc.
 
Thus, USCIS is saying to U visa petitioners:
 
"Help us out here. Tell us all the information you know about you since you don't have documents"
 
Whereas those applying for an I-485 better have their documents. If they don't they are getting an RFE at best, and a denial at worse. With documents, USCIS can tell if the petitioner has a middle name or not. If the birth and passport documents have a middle name and the I-485 doesn't list it, well that's an RFE.
 
The danger to an I-485 petitioner putting "none", "N/A", "NA", "MNU", "NMN", etc. in the middle name field is that the petitioner ends up with a green card that has something NONE as a middle name. 
 
As a former green card holder, I would rather risk an RFE or denial than have NONE on my green card and deal with the I-90 mess of correcting it.
 
So while I cannot guarantee that you won't get an RFE, my reasoning is that you will not. If you do get an RFE, then fill out the form with N/A, and plan to file an I-90.
 
Remember that while every USCIS petition is view skeptically, the most skepticism is for petitions like those for visas like the U class.
 
 
 
 
 

Thanks Mike for your response. My worry was with the recent changes in the way USCIS is adjudicating other petitions like U Visa and T Visa where they have clearly mentioned they would reject if any field is blank. Although no such information is not mentioned for 485 it got me worried. You put in all efforts and submit everything fine only to be rejected for leaving middle name blank which ideally is right since I don’t have a middle name 

My wife has no middle name (technically she has no surname either, but she and her lawyer went with my recommendation to use one of her names as her surname). Blank middle name on her I-485. Approved.