I had a neighbor complain that she had to jump through a surprising number of hoops to get a Real ID license conversion.
And also my late wifes experience as a naturalized U. S. Citizen took three tries although all documents were available and inerrant from the beginning. I still dont believe any significant number of illegals have been able to acquire Real ID. The fed side of the system would catch a large percentage of counterfeit documents.
Here in WA, it is hard for me to imagine an illegal walking up to the DMV counter and asking for Real ID. Although they can get regular drivers licenses, doing a Real ID application would be the same as stating they were illegal. Even if the state did nothing (which it wouldnt), they would be paranoid the the fed would hand the data to immigration since the data is obviously going into the fed system.